It is to my understanding that BCAA's/EAA's aren't DIRECTLY a bulking supplement. Rather, that they prevent muscle catabolism. They put the body into an anabolic enviroment by allowing the body to use other sources than the muscle/protein as fuel, but they don't exactly directly impact it, IMO.
With that said, I'd say either or is absolutely fine, with little to no difference. Some take BCAA's, and love it. Some take EAA's, and love it. Both seem to hit the nail pretty well - preserve muscle tissue under strenuous activity. I sort of prefer Scivation's Xtend however due to the added Citrulline Malate (small 1g dose per serving, but normally your sipping 3-4 servings anyhow). NP has a super hot deal on that stuff right now too.