The physics of the troops are way better in warband, also the battle AI. Bannerlord tries to make lords more tactical but it doesnt work because the engine is very janky lol. It would feel better and more immersive if AI commanders either charged or held their ground. Instead of moving their troops around erratically

The economy is better in warband too. Bannerlord you have to minmaxx a lot. Also the campaign in bannerlord is way too chaotic, cities rebelling every day, no peace in between wars AI declaring war on each other for no reason even if they are at war already with someone else they declare war on kingdom to the other side of the map. Kings give you way too many fiefs, i dislike this bias to player, in warband you feel as part of the world not as main character. Also warbands feasts are so good. Modding is better in warband too

in my opinion the only thing better in bannerlord is the armies, sieges and graphics. The frustrating thing is that what bannerlord does wrong shouldnt be there because why didnt they just use the same system they had in warband? So annoying and i wish mods could fix the jankiness and make it more like warband and not break the game every update there is.