Rainbow Dash's.
Honestly, when Hot Topic made the first two Hot Minute specials, I appreciated them the best since they had their own animations made specifically for these in-character "interviews." I thought those were nice, until Twilight Sparkle's came out, and all it did was reuse animation from the show, and it ended up looking really clunky and awkward. Same applies to the ones that came out afterwards; the clunky animation was too bothersome for me to actually enjoy what the characters were responding with.
With that comment out of the way, I like Rainbow Dash's the best since it feels the most natural, and the little snarky quips she throws here and there are a blast to listen to.