These are the muff's/clones I've had...
USA reissue
Black russian
Green Russian X 2
Green Russian clone
Bass Big Muff
Wren and Cuff Pickle Pie
USA was awful, really tinny and fizzy.
Black wasn't much better, bit bassier, but nothing great.
The green clone I built sounded awesome, although seems a little less bassy than an actual green one.
Bass Big Muff was great. I'd recommend this if you can find one.
Wren and Cuff was really great too.
The Sovtek's are wonderful. I stupidly sold one, but bought another soon after. Maybe it's a placebo because it's a huge old box and all knackered and old, but it sounds so huge and punches you in the face with bassy fuzz. I adore the sound.
They're going for around 100-160 now, but the Bass big muff came pretty close to it. As I say, I'd wait for one of those. Or get a Sovtek if you're rich