So there are a few differences between a company like Verizon and a Network Virtual Mobile Operator (NVMO) like Visible. So the network is the same, but sometimes international roaming can be different. Usually with the NVMO you don't get the perks, like with Verizon I get Hulu, Disney+, and Discovery+ included. Maybe you don't care about that. AND one more biggee. When the network is congested. the NVMO will ALWAYS get a lower priority. Go to a big trade show and Verizon phones may work, where NVMO phones, not so much. Still, a lower price might be worth it if you can live with these things. If you live in an uncrowded area, you may not come across these problems anyway.
I should clarify, Visible is actually owned by Verizon, not a NVMO, but it acts like one.