For me it's X-Wings. Pretty much every rebel list has one if at all possible, unless I'm doing something odd, like a 5-6 A-Wing list or the like.

Quite often that X-Wing is Tarn with R7.

Wedge, Jan and Biggs upgrades change regularly

X-Wings and Y-wings in general. I have to represent those ships

Tie-Defenders when I fly Imp

I have only flown the falcon once in a game.