Latias: 80 HP, 80 Attack, 90 Defense, 110 Sp. Attack, 130 Sp. Defense, 110 Speed
Latios: 80 HP, 90 Attack, 80 Defense, 130 Sp. Attack, 110 Sp. Defense, 110 Speed
Latios is better because, with that kind of speed, you'll be striking first - and thus it's better to have stronger attack than defense.