The thing is, if you wait for the reviews, you're gonna have to pay 10$ more for either. And as they are nothing but rebranded ViSang R02, the reviews won't be very surprising. You could try this: let your sister try your all-around best earphones, once with a low-centered eq (60hz +8, 100hz +6, 600hz +4 etc.) and once with high-centered eq (20khz +8, 16khz +6, 12khz +4 etc.). Of course that doesn't come very close to the actual frequency response differences, but you just want to know her general sound preference. In fact, it would probably suffice to know which genres she listens to – electronica/rock -> PA; classical/jazz/etc. -> M1