Fantasy system
I tried Burning Wheel once...my big complaint with it is the heavy focus on creating a group at the outset (in all fairness, that may have been the GM's bias creeping in, as he was adamant about avoiding any sort of redundancy in the party). The problem was, when we had the inevitable player drop-outs occur, it was really difficult to integrate new players...so the game never really got off the ground.
Experiences like that have made me a fan of simple systems...I appreciate, for instance, the almost infinite adaptability of GURPS, but the lqst time I built a character for it, it was an hours-long process. Burning Wheel wan even worse--it probably would be much simpler in a tabletop setting, where everyone can confer real-time, but in a PBP environment, it took weeks to put the party together.Palladium wasn't as arduous, but I'm not a fan of level-based character advancement so it has some fundamental issues, for me. It's been decades since I played D&D of any stripe, but my favorite is still AD&D, the (sort of) original edition...enough rules to do most stuff without so much minutiae that building a character became more trouble than it was worth (for me).
Outside of that, I don't have much experience with fantasy systems (published ones, at least...a couple of my friends did home-brewed fantasy games that I thoroughly enjoyed...)