Crab cakes are like pizza, barbecue, matzoh ball soup and your momma’s chili: Styles vary geographically, and everybody swears by their favorite. Lump, backfin, a shredded combo of both, spicy, not so spicy, fried, broiled, with filler, no filler, round, flat - each is somebody’s favorite. But thanks to your aforementioned emails, some local trends have emerged.