Math 2 because it covers more topics and your score is higher (although really, the difference between a 760 and 770 is statistically insignificant).
Don’t get caught up with percentiles. It is important to understand that for several subjects, the percentiles are depressed because so few colleges request Subject Tests, that the ones that do are the ultra selective ones. As a result, it is the high achieving kids taking the tests. No AO is sitting on the floor cross-referencing scores with percentiles.