No, he's not a winner. He won EL with Sevilla which is still to this date his biggest and almost only achievement. Rest of his spanish career was a failure most of the time in the league. IIRC, his last season, he finished 7th or 8th.
With PSG, he managed to lose domestic Cups, something Blanc never did ONCE in 3 years. He also failed (albeit with ref help) twice before the CL QF, something Blanc never achieved ONCE in 3 years.
Then he moved to Arsenal and missed the top 4.
The only competition Emery is competitive in is the EL (as shown this year again). If that's he only trophy you're after, fine.