most fleshed out mod

[kgrilla]

i currently have tried bellum imperi , l'aigle ,geukujo im looking for somthing that requires more use to tatics in battle

[BrowneHawk]

floris maybe

[Morkonan]

Floris has decent AI behavior. It's also probably one of the most "fleshed out" mods, in general. (It's a modpack and has just about every good mod for the base game in it, at the time of its creation, in some iteration or another.)

I don't know if any more behavior improvements have been made, but Silverstag is the spiritual successor to Floris. It does alter some of the base game, though, but there could be some improvements, there.

If you want to strictly play native, you can try this: http://www.nexusmods.com/mountandblade/mods/3784/? (Formations and AI) It's often bundled in mods/modpacks, in some form, with PreBattleOrders and Deployment. (Or, maybe they've merged, now? Dunno.) It makes battles significantly more realistic in the way they unfold, IMO, where I've seen it used. You can look around for mods that mention that they include a version of it if you're wanting a different setting or a complete conversion. I'm sure that many do. However, I am also sure that some don't get the merge right and funky behavior can result, either due to a mistake or due to weapon/unit changes that the AI can't make a lot of sense of.

[kgrilla]

evolved or pack

[Lonesome 77]

L'Aigle has that PBOD mod which helps with tactics in battle.

[Frondson]

I've been playing Brytenwalda for 100 hours or so and think it's pretty great.