I am Platinum on AA this year after being exp for many years, and recently got a status match on UA to prem.-ex. I live in Boston, and travel mostly domestically. I am pretty familiar with both programs, but I am wondering how UA's upgrade percentages compare to AA's in my elite level. I understand UA's domestic upgrades are free and AA's I need to use the stickers, that doesn't matter to me, I just want to be chose the airline I will "on average" get upgraded the most on? Any thoughts? thanks!