What is the best modifications/subpatches?

I have read about Modification/Subpatches thread.
Some of them are impossible to take, some other work correctly.

What mod/subpatch are the "must have" on Brytenwalda? I havevalued some, but I have many doubts about.

It really depends on what you want in your Brytenwalda. Some people like their spears to have different animations and attack directions, some play with a companion submod. There is no penultimate Brytenwalda build due to how everyone's tastes are a bit different. It's best to take a good long read of the changes a submod you're interested in introduces and then decide for yourself whether it's right for you.

That said, I can tell you what I'm using. After installing Brytenwalda and patch 1.41 and then the graphics pack I roll with this.

The TML Submod with 1.22 compatibility patch for 1.41
vidamir's Spear Buffs (for TML), Scene Updates and Tree Updates
and finally my own Unofficial Graphics Pack Patch. ( sorry, can't help but toot my own horn)

I dont know any subpatches on the original theme but a complete submod called a world of ice and fire is pretty cool it is based on the game of thrones. The best way to put it is a  clash of kings with brytenwalda mechanics. It does not have the story like the clash of kings so the night's watch can attack house arryn so it is not so accurate mod and it lacks the finishing touch of the clash of kings but its kinda fun mod and as i mentioned it has the night's watch as a faction and the wildlings too. (A clash of kings has the free folk(wildlings) as an invading faction that spawns after a certain quest and takes of the whole kingdom of the north )