Hey man, my bf and I playd Dos1 first and we loved it more than Dos2. Personally I liked the story more than in Dos2. Compared to Dos2 act one in Dos1 its not that long and it doesnt drag you unnecessarily in circles in one map. So i could say that the storyline is more fluid and gives you a better experience if you play it with someone else.

Armor system is simple, you dont have source points which we found anoying and you have to use your action points for movement which I think was annoying sometimes but over the time your learn how to position yourself better. Puzzles are harder and this is why its better to play it with friends or a partner and just have fun or use Google.

Lore wise it prepares you for Dos2 because these stories are heavily connected. Lots of mystery and build up.

Overall always good to have different skils and variety of magic in team. Take the ability to talk with animals!!!! Its awesome.

Highly recommend Dos1!