"Is there more to..." - derailleur hanger alignment; derailleur adjustment; chain quality, length, and condition; cassette quality & condition; housing & cable quality, housing length, and cleanliness of the housing and cable sliding through it; shifter quality (When cost is an issue, always upgrade the shifters and downgrade the derailleurs), rider skill & experience; etc. And don't even start worrying about the crankset.

Go with the bike that makes you smile the most when you're riding it (And accept that you'll likely spend more than you planned). Good luck...