I like flat, it's a good compromise, though it is much more toward the camber side of the spectrum. A lazy man's camber, so to speak, or "dead" camber. You get the same edge hold and railability for carving as well as no rebound but it also doesn't require energy to decamber the board to get it to turn. Snap is almost the same as camber. Camber still is definitely useful.
After riding The System, I don't think I'll be on hybrid again, although hybrids do offer an awesome compromise of camber and reverse camber with few of the drawbacks. Just has a mild learning curve. However, I've found that The System gives you full rocker (awesome playfulness) and addresses many of the drawbacks that hybrids try to without losing the benefits of continuous rocker.