Core tones, I preferred the D120, but the UL definitely wins for flexibility. I only used the EQ on the UL for subtraction, never addition, so it's not a huge deal to not have it.
The D120 sounded massive. If you need a dedicated clean, consider getting a EH Signal Pad. I used it as a pseudo-channel switch with great results for going from pretty darn heavy to a sweet clean that would break up a little if you dig in. That and a loop mod and you should be set.
The UL really never gave me that OMG feeling like the Sig X, D60/120 and even my Pittbull Classic do/did. It might have been the cabs I had at the time which played better with the other amps. I had a Mills 4x12 with V30's as my main cab... I guess the UL just doesn't really like V30's. Also had a Genz Benz G-Flex 212 with EVM12L and stock speaker.
I've come to prefer the Sig:X of all of them, as it feels somewhere in between all of them, though a little bit more forgiving than any other Fryette. I traded my D120+300 for the Sig:X and never looked back in Fryette-head land. To me it's like a tighter Bogner Bogner 101B Ecstasy (which I was also eyeing at the time). The Sig:X is just incredibly versatile.
I still have my Pittbull Classic combo and probably like its distortion tones the most overall of all of the Fryette's I've had, but I prefer the convenience of a head/cab setup so generally use the Sig:X between the two of them. These days though, I'm still in the honeymoon phase with my Diezel, so once that wears off I don't know which one will be top dog. Been considering getting a head cabinet built for the Pittbull.
Also considering selling off a couple amps and getting an Axe Fx XL rig. We'll see on that front though.
