Tricky one that. The league is a better measure of whether you are the best team in a given season - no-one can possibly say Chelski were better than us last year.
BUT the pleasure that comes from achieving something meaningful for the first time (or for us after decades) is wonderful. I give you Wembley SF 2011, Wembley FA Cup 2011, Sick swan, 93.20 and even last season CL SF. They were glorious and enjoyable. Winning the CL will provide that, another Prem doesn't give the same emotional kick, however well won. Be nice to shut everyone up as well.