So I got the core version first, and I really liked how adjustable the settings were. Like it's way way more than just two or three factors you can tweak. I realized, though, that I really just wanted the horsies to be able to nibble and drink, so I went with the no-core version, and I think it's great. I especially like the "rest" feature. Finally, Danny can sit down and not stand around awkwardly while I carve X's into 2,000 bullets.
If you're into immersion I would highly recommend looking into this mod. It makes the horses seem more lifelike.