I switched from AA when they canned MRTC. For me at 6'3" it's a no brainer - UA because of E+. A couple of months ago I sat in the back on a transcon and was shocked at how I'd forgotten how cramped it was compared to E+.
Yeah, it's nice, isn't it?? I've got MSN-ORD-NRT-BKK-NRT-ORD-MSN coming up, and it's all in E+ (well, except for the MSN-ORD-MSN RJs). Should help a lot!