What the holy hell are you doing that you're having trouble with e-mail, of all things?
Support for IMAP/POP3 have been in the Android core for as long as I've been a user. And Exchange support is seemingly native to everyone running Gingerbread or newer. And in my experience, they've Just Worked as well -- even with several migrations from vanilla to/from custom roms and phones. And, for what it's worth, I'm sure iOS e-mail support is no worse.
I suppose you could use my father's experience with his Xperia as evidence of Android e-mail issues; but 100% of those issues are entirely due to him fat-fingering his password and then swearing at his phone a few times.
In all seriousness... There are issues which I will gladly agree that a given phone/OS is better than another on. But there are far more where I look at the user as the problem. This is one such issue.