I only have a Delta midi, not anything to brag about. But if I were to pick between the two, I would personally go with either the Nova DVR-XP (for nice features like the direct-drive motor and other widgets) or keep my eye open for USED versions of either machine.
You really won't go wrong either way. Both have an impeccable reputation.
BTW, if you can buy either lathe locally for a reasonable price, do so. For various reasons I prefer to deal with local guys when possible (except when buying pen kits, lol, then my buck goes to Ernie, Bill, and CSA).