I love both, but I prefer Latias to Latios. I fell in love with the red dragon when I first watched Pokemon Heroes due to her design and personality, and I've found her to be a competent battler. (Heck, one time I 6-0'ed someone with a mono-move Latias who had received a +6 Def. From AcidPass Vaporeon.) I don't believe her to be stronger than Latios, but she's still capable of fighting!