I wont vote, but bannerlord only because the graphics are nicer?
Besides that there is no way it is near as good hahaha. Unfortunately.
It also has better feeling mass combat and a better feeling economic system. Warband mods attempting to correct this tend to end up fairly jank in ways not to unreminiscent of bannerlord's current base jank.
I also like the character system in bannerlord more as a concept, but it's extra jank at the moment. Less and less jank from every patch luckily.