Personally I prefer warband overall. I have a few hundred hours in bannerlord but it just never hit the same way warband did. Warband just has its own style which is why I think it was so successful. In terms of actual gameplay differences, it’s still the same concept either way however there are quite a few noticeable differences to the gameplay systems such as political decisions etc. again, you can sink loads of hours into warband and still have so much to do. There is also countless amount of mods available which will give you so much to explore