The last couple of posts make good sense. The first one...not so much.
Balanced pre & amp will provide 6db additional gain and reject noise. It's a clear advantage.
Comparing balanced vs. SE pre to SE amp, both can sound good. It depends on the merits of those designs. If you ever move to a balanced amp, then you can take full advantage of balanced preamp's capabilities. There isn't a reason to reject a balanced pre now just because you are currently using a SE amp. Cheers,
Spencer