I have 8-10-12 B5 and really like'em
I have not tried that Edge, but I sincerely doubt it is possible to boost significantly better than the B5.
I come from C kites (hadlow pros). Using that C kite aggressive jumping technique on the B5 almost scared me the first time. Never gone that high before

Looking forward to some good old schooling on those kites. Must learn that darkslide