I've got both, a crx with a zc and a 4dr civic with a mini-me d15z6(but I guess that doesn't really count) but I'd half to say go a sohc since there's mad parts out there and the zc is a aging platform plus there's so many leftover sohc vtec from people doing swaps if your goes kablooey you can find 'em pretty easily and cheap. The zc is nice but harder and harder to find parts for.