I have had them all. The Cultreti amps used on Vai’s record and other 100s as well as all incarnations over the years and I like all of them as they all offer up something cool. My current one is a 2006 or 2008 and rocks.
Ok, just played the Classic for the first time in quite a while and it’s sounding pretty damn amazing haha. And not as loose/round as I remembered. Maybe it’s just my mood.. I haven’t played my gear in a very long time and it’s all sounding so good. I guess when I play every day I start picking things apart.
In answer to the OP question… my vote for the XTC with the biggest nuts goes to the 100A/B. The Classic comes in next. But, that’s just my twisted perspektive