Interesting topic. Screaming cat are the most expensive and probably the best bats in the world. Julian millichamp made bats are used by many professionals and if you ask him, he always prefer spine height over edge and doesn't do any concaving. Instead he goes for an extremely oval handle. Big edges only help reduce twisting the bat in hands but you can have the same effect by an oval handle. If anything, big edges means concaving means lower spine height means smaller sweet spot but bigger looking bats. Carefully see the bats of professionals, they have minimum or no concaving on theirs. Of course their clefts are special and big edges are the result of it but I would chose big spine over big edges and an oval handle any day. Talk to any expert pod shaver (Robert pack, Julian millichamp etc.) and they will tell you the same.