No what you get with more power is better tactilitly, and it's not so much the power as it is the quality of term. With a larger balanced amp you get a cleaner power, and a better amplifcation. If the O2 was really an end game amp. Companis like schiit would have no market for their balanced products, and Jason Schiit him self would be a liar and a failure as an engineer, rather the fact of the matter is balanced amps offer a better quality of sound [ofc they also have more power on hand]
Non the less, if you go Balanced or stay with Single End is up to you, I found balanced amps to have a better quality of sound over all
So the choice is up to you, I will warn you that once you go Balanced your stuck re cableing everything you own, which gets costly
but I've found as well as others, that balanced amps offer a better quality of sound. You want proof, look at Schiits TOTL amp. They are balanced, the reason cuz it's a better quality of amplification.