Not much point in build recommendations as the combat in both games is trivial. KotOR was novel because there wasn't much in the way of RPGs set in the Star Wars prior to that time, but the separation between light side and dark side choices is extremely juvenile (chaotic evil Saturday morning cartoon murderer vs. shallow altrusitic angel) and the characters are beyond annoying (e.g. Bastila is bitchy tsundere type for male character, Carth IIRC is the same but for females).
You should have bought Serpent in the Staglands, Battle Brothers, Age of Decadence, or Underrail.
You're telling someone to buy Simcity instead of Heroes of Might and Magic. They are completely different games. Kotor is nothing like Underrail, it's like saying "Don't play Dark souls, play Age of Decadence!". Apples and oranges my frined.
KotOR 1 is an M.Night Shymalan plot wrapped in mediocre combat and roleplaying systems. KotOR 2 is a thoughtful deconstruction of Star Wars tropes with dialogue improvements made in the mold of the aforementioned mediocre combat system. Serpent in the Staglands has a better narrative than the first and treats the player like an adult with respect to exploring the game world; the combat systems are not exactly a wash, either. Age of Decadence has superior CnC, character building mechanics, and combat mechanics as well as roleplaying systems in dialogue (hard to separate from character building here). Battle Brothers has far superior party-based combat mechanics than any similar game I have ever played (leaning towards wargaming)--this might be the only legitimate comparison you made here. Underrail has far superior combat and character building options (possibly dialogue as well, though I haven't played it far enough to say with confidence).
All of the games I mentioned are either in development or recently released (and thus ripe for development in further installments), are better in at least one way (short of the license), and don't contribute money to known decline-enablers.
In short, you are an imbecile without wit or insight.