Which dice mechanic appeals to you?
Honestly, as long as the mechanic falls into my “emulative & elegant” rubric, I’m good with it.
That said, I will admit to a long-standing love, born mostly of nostalgia (but not entirely — I find them emulative & elegant as well), of two dice systems: Percentile (my first, through Top Secret, and via my favorite emulative system, James Bond 007), and the D6 System (bunch of D6s, including a Wild Die for extra potential — in it’s best form in West End’s Star Wars).