Why not have a follower who is also your wife, all the benefits in one package. --- You can't make an omelette without crushing dozens of eggs beneath your steel boot and then publicly disemboweling the chickens that laid them as a warning.
I don't know about Aela, but Mjoll won't shut up. She just keeps talking and talking and talking. I liked it at first, but it gets old fast. --- The world should realize with increased clearness that Evangelicalism stands or falls with Calvinism. (Dr. B.B. Warfield)
Who is better follower between Mjoll and Aela? Higher starting stats? My only suggestion is to not have a ... what do you call that, a person who watches your house if you're a Thane? as a follower because if your house is left unattended it could get robbed. Just one of those random things.