u/IXMachina

I live in Canada and I'm looking to get a OnePlus 15. I see that the phone is available in both best buy and AliExpress and the one in AliExpress is significantly cheaper. I also can source the phone from India and it's like 350cad cheaper that way. My main question is if there is going to be any difference between the versions. I have heard that some bands might not be supported if I get the Indian version so possibly worse signal, but is the same true if I get the global rom version from AliExpress?