It always depends on the game. I tried the above soundfont with Duke3D and ROTT.
Yeah I keep testing certain games which I know to use the extended Sound Canvas features (in SCC-1/SC-55), like many Origin games (Privateer, Ultima 8, Wing Commander 3), Dune 2, Descent etc., because I also want to hear whether the said soundfont seems to support those features, like the extra drumsets. This soundfont sounded strikingly less impressive (than e.g. Chorium) especially in Privateer, which I personally consider as possibly the best sounding General MIDI game I've heard. That flight music, oh my god...
As far as I know, Duke3D and ROTT (as well as Doom 1-2) use vanilla General MIDI, so there Sound Canvas compliant soundcards/soundfonts don't really get any edge over vanilla General MIDI cards, but sound more or less the same. Admittedly, most General MIDI games probably supported just the vanilla General MIDI, but some composers went the extra mile with GS extensions.
To be honest I don't like Timbres or Chorium much. It's not that the instruments are bad by themselves but they are very badly balanced. There is always one or more instruments which sounds to low or too loud compared to the others.
That's why my favorite is still the scc-1. It's hard to beat the soundfont most games were developed for after all.
That's interesting, because I had (still have) a real SCC-1 sound card too, so I had been specifically trying to find a soundfont that would have a similar balance and otherwise resemble SCC-1 (I was mainly trying to find a real genuine SCC-1/SC-55 soundfont, or e.g. Yamaha XG which I knew sounds quite much like SCC-1, but even better).
Chorium ended my search, its balance seems very similar to SCC-1 (even in those games which specifically support Sound Canvas extended features), and to me it overall feels like a superior version of SCC-1 sound font, similar feeling I've gotten e.g. with Yamaha XG sound cards.
BTW do you have some actual (genuine) SCC-1 soundfont? I earlier tried to find one but I think they were merely fan made "remakes" that tried to sound like SCC-1/SC-55, but had differences here and there. And as said, then I felt Chorium pretty much sounded to me like an improved SCC-1 soundfont.
As for Timbres of Heaven, I kinda agree that its balance is somewhat different from a SCC-1, like I keep mentioning the intro music of X-Wing (or was it Tie Fighter?) where its loud horns eclipse rest of the instruments. That is why I don't recommend it at least as the only GM/GS soundfont, and frankly I think it went a bit overboard with its huge size (304MB). But, it also needs to be said that it has possibly the best quality instruments, partly due to its huge size, so it has the potential to sound the best.
But as many times said, one just needs to try out different soundfonts to find the one the most with your liking. Arguing about which is the best soundfont is almost like arguing which color is the best (yellow, because I decided so back when I was a kid).
What SCC-1 soundfont are you using?
I had the same question. :) Not sure if he was talking about a real SCC-1 sound card, or a soundfont.
I've found two soundfonts that claim to be Sound Canvas soundfonts:
GS sound set (16 bit).sf2 (size: 3.31MB)
Roland SC-55 v1.1.sf2 (size: 9.42MB)
but IIRC they didn't quite sound the same as my real SCC-1, so they felt more like fan made imitations of Sound Canvas. Or then there have been quite different sounding SC-55 sound fonts than what my SCC-1 sounds...