I like the wide backs. I usually buy mottled fabrics or a simple, muted print. I've bought the wide backs mostly at Mary Jos Cloth Store in Gastonia, NC, but I see their prices have jumped way high. They may be cheaper in the store. I haven't been in there lately.
But having said I like the wide backs, I've been strongly considering switching to QAYG, so I could be using smaller pieces of fabric. I'm not sure if I'll do a single block at a time, or a row of blocks at a time. I could continue to use the wide backs, and piece the batting in strips, piece the blocks and sew into a strip, then just add a strip of blocks to the quilt at a time. I'm quilting with a DSM.