Welcome to FT, nkrijeka

I only fly 50k or so a year, mostly domestic, so am less experienced in answering your questions than most. I moved from UA to AA this year in large part due to the increasing use of Canadair RJs by UA. Like you, I value E+ as a primary elite benefit, but find the E+ in the UA RJs just too uncomfortable on flights of 2.5 - 3.5 hours. You might want to look at what type of plane you would be on for your domestic travel on UA as an additional deciding factor.