Volcano Digital - Good, but not worth the price increase for a digital temp, although the warranty is longer. The classic actually heats up faster and you just need to know what number to put it on. I like vaping from 6-7.5, and 8 if I want the last dregs.
I got the Easy Valve, it's much easier if you're lazy, and you can still replace the bags manually. All you need is a flat head screwdriver, some Baco Turkey Bags, and some patience. You can replace your bags for a couple of dollars instead of paying 60 bucks for a whole new set of bags. Though the Solid Valve is still cool, and the mouthpiece is metal. It's much easier to replace the bags though, and from my experience with it, it seems real easy to clean the mouthpiece. Feels more sturdy than the plastic Easy Valve.
All comes down to what you prefer

Just remember, don't put the valve on the Volcano whilst it's heating up!