Help me choose Outdoor Motion Sensor

I have a DSC LC151 (PIR + 10GHz Microwave) that I need to replace due to about 12-15 false alarms/day. I use it as a driveway sensor, it chimes my alarm, it's a monitor only zone.
 
It's rigidly mounted on a wall perpendicular to cars driving up the driveway, so it works great as a driveway sensor. It sees full sun in the AM only, no false alarms. In the afternoon, it's in the shade. But on the other side of the driveway is a tall slope, mostly weeds, small trees. The slope faces west, so as it heats up and the wind picks up, it's falsing. 
 
I had assumed the microwave would eliminate falses, but it appears to be useless.  
 
So after some research, I've narrowed it down to 2 options.
 
DSC LC171 - Has Dual PIR + 24GHz microwave (Same as Crow EDS 3000)
 
Watchout DT Extreme - Has Dual PIR + Dual Microwave (10GHz)
 
Any recommendations?

Yeah, get a driveway sensor if you want a driveway sensor.

^^^ What he said ^^^^

OldTimer said:

^^^ What he said ^^^^

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Nope, a driveway sensor is buried under the driveway,  or occasionally mounted along the side of a driveway, and certainly not on a wall. They also never use PIR OR microwave. They detect the metal in a car.

I'm looking to detect cars and people walking up to the house.

How does a car walk?!

I've been using Optex Outdoor PIR dectors for more than ten years without any problems.  The model that I use is LX-802N (long range).    My Optex PIR detectors have been installed more than ten years ago.  So, there may be newer models available.
 
I also use the Cartell driveway sensor to detect car movement only.  It's buried in the ground beside the driveway.

Here too utilize Optex PIRs and a Cartel driveway sensors (2).

+1 on the Optex. I have been using one to detect people and vehicles in driveway for over 10 years. Very few false triggers. Sometimes when it is very warm out it does seem to miss catching people walking. Guessing it can't tell between the warm driveway and the person.

I use Optex as well. Here in AZ its is pretty warm often, and they don't work well when its warm out and they often will false if there is moving plants or trees in view when its windy. It works excellent as a wind detector. The driveway sensor is always reliable.

ano said:

Nope, a driveway sensor is buried under the driveway,  or occasionally mounted along the side of a driveway, and certainly not on a wall. They also never use PIR OR microwave. They detect the metal in a car.

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Wrong. They detect (changes in the area magnetic field) the noise from the ignition. Many electric cars can side by if they can coast past the sensor without creating enough of a magnetic field. 

If you're looking to get detection for motorized and foot traffic you're looking at a PE beam based product. If you're trying to detect vehicles only, a magnetic or hose based (think old school service station) type item is needed. If you're looking for absolute or as close as possible for vehicle based you're going to need a loop detector.
 
Nothing is absolute but that's what's out there. PIR or multi-tech devices will not be adequate based on false triggers alone. Same goes with MW units.
 
@ Old, I've installed plenty of Cartel type units and they have no problem detecting golf carts, which is as electric as you can get. Usually the issue is where the probe is located and sensitivity adjustment. The majority of the units I've seen are almost never installed in the center of the driveway.
 
@ Ano, the probes can be installed almost anywhere, even above ground, but it needs to be parallel to the roadway and the higher the unit, the less it picks up. Same holds true with traditional loop based detectors....they work great for the undercarriage of a vehicle but less so for a semi truck and trailer. Many times the poorly adjusted units either don't work well because they're installed too deep or not adjusted sensitive enough to pick up the axles of the vehicle itself.

I used a photobeam on my old driveway and it worked OK (well except for lightning sometimes would trigger it).
 
You can add one for foot traffic and combine it with other sensors.    There is a DIY out there in internetlandia for creating a nice small and cheap footstep vibration sensor (this could be anything these days).
 
Add CCTV to finish your soup.

OldTimer said:

Wrong. They detect (changes in the area magnetic field) the noise from the ignition. Many electric cars can side by if they can coast past the sensor without creating enough of a magnetic field. 

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Mine has no problems detecting electric cars (I have a friend with one that visits), and will even detect a bicycle if it is relatively close to the sensor.

DELInstallations said:

@ Ano, the probes can be installed almost anywhere, even above ground, but it needs to be parallel to the roadway and the higher the unit, the less it picks up. Same holds true with traditional loop based detectors....they work great for the undercarriage of a vehicle but less so for a semi truck and trailer. Many times the poorly adjusted units either don't work well because they're installed too deep or not adjusted sensitive enough to pick up the axles of the vehicle itself.

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Yeah, probably a billion kinds are available. Mine is wireless, about a foot tall, and installs on the side of the driveway. I didn't want to do any digging. And yup, I can catch golf carts usually as well.