ACE Studio recently released 26(!) new voices specifically targetting the exact needs of professional producers: I believe they'll overtake SynthV among casual English-speaking users if Dreamtonics doesn't rapidly increase development and improve their marketing.
ACE uses visually pleasing stock images for their professionally oriented vocals, which is much more appealing to that demographic (and perhaps most people) than DT's inconsistent spiky letters. They catch the eye, provide a clear picture of what type of voice they are, and still feel 'pro'. Sometimes, the oldest vocal synth marketing tactics are the best, haha; Leon and Lola knew. ACE's controversies aren't well-known outside our community, so their reputation can't hold them back outside the fandom.
There was a period when it seemed inevitable that SynthV would become the defacto vocal synth for professionals, but Dreamtonics has lagged behind in its development of English voicebanks, leaving Eleanor, Natalie, Anri and Solaria as the only feminine options for years; which no real choices for common genres like RnB, heavier EDM, a ton of vocal trends in pop, pop punk...etc...etc.... Combine that with nonsensical ads that fail to explain the product, terrible visual design for their in-house vocals, and poor SEO making their outdated SynthV R1 appear first on Google (so many potential customers have bounced off because they accidentally downloaded the wrong program) they made it easy for competition to come in and eat their lunch.