I prefer Sarah over other VF characters because I find she is easy and does good damage. Jacky doesn't appeal to me because he's male. Akira's too difficult (he's also male) and Pai doesn't do enough damage.
LoL.... Sarah's history is weird as you know.... in the VF games the character's style is displayed under tgeir name.... in VF1 all the way to VF4 both Sarah and Jacky's style was Jeet Kune Do. It wasn't until VF5 that Sarah's style description was changed.
Sarah has quite a few moves similar to Jacky but not completely the same.... examples include the Backward Slide & the Slide Shuffle, The Spin Heel Sword, The Dragon Kick & The Fire Darts. Their styles are obviously different and they can't be played the same way but still..... some of them look Similar. So I think its fair for Sarah to be part of the JKD Club.
I don't have much experience with virtua fighter (only playing VF5 vanilla) and I didn't really like it. Sorry i didn't know that. IMO she doesn't look like she uses Jeet Kune Do.