Latios > Flygon > Salamence > Rayquaza > Dragonite for me.
Latios, I like it because its cool looking and I've always liked it since it came out.
Flygon same a Latios, I just think its interesting.
Salamence is just beastly.
Rayquaza, same as Salamence, its mostly it's appearance...
Dragonite for nostalgic reasons. LoL well... I guess I like the other 4 for that too.
So yeeeah...