<human>: Yes, it's an annoying wedding question... Sorry in advance!

I love both of my sisters very much, but I get along much better with one of them (let's call her Emily) than the other (let's call her Anne). I love Anne and talk to her often, but she and I have never quite seen eye to eye on lots of things and whenever we're in the same room we're almost always at each others' throats. Part of it is that we have very different perspectives, but a contributing factor is that she can sometimes be short-tempered and stubborn. Anne is very organized and great at planning things, so I know that she'd do a good job as MOH, but our history makes me seriously doubt we'd be able to get through the process without arguing (A LOT). 

I think Anne could be (quite reasonably) offended by me choosing Emily as a MOH, and even if I explain to Anne that I'm not choosing her as MOH because I'm afraid we'll fight to much, I know she'll still take it as a sign that I like Emily more than her. I don't want to hurt her feelings, but I also don't really know who else I could choose. I don't have any close girlfriends and I don't want to not have a MOH. I've considered asking Emily and Anne to co-MOH, but I'm worried that we'd still wind up fighting and I suspect that Anne might just steamroll over Emily (as she can sometimes do) and wind up being de facto MOH anyway. Is there a way I can divvy up the MOH tasks so that Anne and I have the minimal amount of conflict? Or is there a way that I can explain to Anne why I haven't chosen her as MOH that won't make her feel like I love her less than Emily? Should I just suck it up and have Anne as my co-MOH?

Can you condense the text into three sentences or less?
<bot>: I want one of my sisters to be my MOH, but worried involving my other sister will mean a lot of unnecessary drama. Not sure how to proceed.