Here, look at this: https://docs.google.com/spreadsheet/lv?key=0Aly8njaU3H1adGJYTlJaUnRxRUN2RnM5MkxPaU1mQkE&toomany=true
^List of follower stats.
Worth Mentioning, the next two best sneaks (after Aela/Cic) are both casters. Faendal is the next "attacker" in the group.
Beat me to it!
Hmm, that document lists Jenassa's sneak as 49... that can't be right.. A few things about it seem incorrect actually. Erik the Slayer is listed as having 0 sneak, but I remember in the PC forums someone delved into the game and founf out he does actually have some level in it, albeit low.
But anyway, I've played with Eola and Marcurio, and they seem to do very well.
(I'd love to see that document updated with all the DLC followers. As it is, it's completely vanilla)