I'd really like to see AT4 "out-amp" S-Gear...that's now the benchmark
in amp sims IMO. I haven't used anything that sounds as good. Granted
it's not as extensive as RV4 or GR5 or AT4, but it sounds SUPERB - no other
word to describe.
That's a TALL order...but one can hope!
Bias Desktop, if you like to "tweak" for Rock and Metal is also superb,
but doesn't nearly match S-Gear overall. (The pretty pictures are
Tre-Kewl also

(
Baps))
Waves better poop or get off the pot with GTR3...that program is
getting VERY long in tooth...it can still get usable sounds, but it
takes some doing.
AmpLion Pro can be decent, Kuassa can be decent, and the freebies
are quite surprising given the right place and care.
Recabinet 4 with Thermionik also has done a decent job, but limited in scope.
I've never had the pleasure of using the Softube Amps or BX_Rockrack,
so can't comment much about those.
Amp Sims are getting quite numerous...but, IMO, S-Gear reigns supreme.
I use ReValver 4 quite a bit, and have been "re-exploring" all my Amplitube gear,
since I just picked up a bunch of new amps and cabs...
(I almost have everything AT- I do have everything TR)
...but sound wise, they don't have the "feel" or the "sound" that S-Gear has...
and the effects in S-Gear are outstanding...and I want to feel it soon!
(before the 28th!!!

- cuz I never pay full price LOL)