First of all - okay, it's not a Virus TI... but so what? The actual sound hasn't really changed, and I'm not going to compare their synthesis depths and other technical stuff (well, maybe a little). They both have more than what's needed to create original sounds.
So let's say it's Radias sound vs essential Virus sound.
I was really impressed by the quality of this ol' man (Virus) - some "real" patches sound very realistic, I can't imagine Radias doing the same (though I may be wrong, I'm not a pro sound designer).
+1 for Virus sounds
Basses are just awesome, thanks to a super fat comb filter and filter saturation - lots of low, punchy frequencies - there is no way Radias can do better.
+1 for Virus
Effect section: it's just different.
Virus has dedicated effects for each part
Radias has insert effects.
But I think I prefer Radias on this one, because you can choose your effects, and there are dozens of them.
Virus has only couple of effects. (distortion, phaser, chorus and reverb/delay) per part.
+1 for Radias
Intuitiveness:
Without any doubt, Radias. Every paramater has it's dedicated encoder/button, while on virus there only essential real time knobs - all less essential parameters has to be changes in menus.
Not to mention that Radias is very easy to control in the dark.
+1 for Radias.
Value/use of the sound:
Okay, earlier I said that Virus sounds "better" - well, this is not necessarily true. Yes, I was really impressed by some sounds, but when I started to make my own pads/basses/leads, I felt that they all sound very evil and dark... and all presets sound also very dark.
So my conclusion is: Virus is like a demon, with its black/red design and yellow/green LEDs and screen.
Radias is like an angel, with it's silver design and bright yellow halo LEDs - and it sounds very bright also!
My IMHO - these two sound 100% different, and I can't say that I prefer Virus sound.
For example, I really like warm, smooth, silky, mystical, fairytale pads, but I don't think Virus can sound warm/good, due it's character... even most huge pads I made (or presets), using up to 8 voices unison, sounded just way to dark, evil and heavy.
But for aggressive/acid basses - Virus, no doubt about it... Radias is just too good, and when it tries to behave bad, nobody believes it

Virus also has very fast envelopes, so those "trance attack" sounds, are awesome too.
So - does Virus series sound better than Radias? Certainly not, they sound just different.
As for me, I think Virus b is a perfect addition to my sound pallet.
(I don't really need this Total Integration or more than 24 voices - I just wanted some typical Virus sounds - well now I have them)
And I think Radias would be just as good as Virus in trance context.