Currently I enjoys modded Warband more than Bannerlord.
Favorite mods:
1: The Last Days. Pretty much my favorite mod. Unique, plays well, runs well, very good optimization.
2: Gekokujo. The basic version. Pretty much the best optimized mod in Warband's history. I also like pike&shot warfare.
3: Deeds of Arms and Chivalry. Very nice historical mod (100 years war). Some scenes are buggy, but no big deal. Looks lovely and plays well.
4: Crusaders of Might and MAgic. Unfinished, unbalanced. Crazy fun. Not suited for a serious long term campaign, but this is the mod I start up when I have a spare 20 minutes only, and want to get into some fun fights.
Also liked:
1: Prophesy of Pendor. Not really for me. The setup phase is very-very long, seems neverending. But I have to admit that it is very polished, and a win is very satisfying, so I understand why it is popular.
2: Suvarnabhumi Mahayuth. Hm. Very unrealistic guns (you will be often instakilled by arquebus fire from 200m, while wearing a breastplate. LoL
), but this south-east Asia setting is unique, the countries are different in both presentation and gameplay.
3: Viking Conquest. I loved my first playthrough, and the expansion is good quality. However it is realistic but grindy, similar to Brytenwalda.
4: 457 AD: Last Years of the Western Roman Empire. I would call this "Brytenwalda light". I really like this, because it feels similarly realistic, but you can actually play as a horse archer. The walking animations are horrendous though, so you want to fight on horseback.
5: Honor & Glory. This is rather a mod with very good potential. Similar to With Fire and Sword expansion, but the region is bigger. (ie. there are ottomans and Habsburgs). I really like this, because the feel is similar to WFaS, but with the quality of life improvements of Warband. There are some smaller bugs here or there (eg. Habsburg/Ottoman place names in Hungary, but understandable since the devs are not from the region). Developers are open to suggestions.