From what I've read, the answer is what you would expect it to be.
"No, you don't NEED a Virus, although the super saw is perhaps its strongest reputational area of performance for a reason."
You can import TI Hypersaw waveform into Serum and unison, detune, etc. - stacking MIDI octaves, adjusting velocity of each layer, etc. - other synths have their own idiosyncratic strengths and viable super saws as well.
Personal anecdote: I bought a snow after becoming enamored with its reputation and reading many inflationary claims of its unparalleled quality on forums. Listening to preset bank demos during its shipment transit I thought to myself "this is it. This is clearly a starkly superior sounding synth, this must be the secret to attaining such high definition sounding leads."
When it came, I was disappointed and had to admit that many of the posts whose content and admonishments I had repressed in my singular obsession with acquiring a virus and the idealized salvation that would ensue thereafter were right. Severely disappointed.
However, I am now very happy to have it primarily because of the supersaw and sound signature that is ubiquitous in my genre of choice, Rawstyle. Most of the pros use it, almost all afaik.
That being said, I definitely have a problem with searching for exogenous cures to an endogenous problem - always looking for the answer in more tools & plug-ins instead of doing the deep work necessary to produce quality music.
So yeah, ofc no binary answer but the more trance I listen to, the mixing is incredibly impressive, the fluidity and movement/modulation, it's magical. Many of the synth sounds are secondary in this respect to the primacy of the mixing and arranging and I'm sure most of them could be identically achieved with Rapid, Sylenth, Serum, Omnisphere, Diva, Dune 2, etc
I would say follow your heart and your research while trying to maintain sobriety and not hallucinating a mirage of some miraculous key which instantly unlocks the music of your dreams and upgrades your production exponentially although if you do find one please let me know, I'll pay you! Lol
You could always used snow with a return policy and test it out, resale value is pretty consistent, so the risk isn't too fatal.
other than that I think what separates us from pros is just experience and intangibles , etc