Awesome, glad you like them! I agree that Altitude is the most capable and best sounding synth of the ones you've listed.
You'll be happy to know that I've been hard at work at creating an ambitious gigantic preset bank for hard dance electronic music covering basses, leads, chords, pads, effects, and screeches - aiming for well over 500 patches! This will be coming sometime next year, but unsure when as I'm balancing other work and life as well. Just know that it's coming - I advise you hop into nakst's Discord server (https://discord.gg/aHnUxztsVe) if you haven't already. I share presets there for Altitude and Apricot every now and then.
I can assure you that Altitude is well worth its weight in gold. It has quickly become the sole primary synth in all of my music, only reaching towards my Virus TI or Serum every now and then for specific sounds. The no-VST situation is a non-issue (see here: https://github.com/free-audio/clap-wrapper), and even though there hasn't been any *public* updates for quite some time, I assure you that nakst has been working on Altitude beta updates that I have been testing and giving feedback/suggestions on. As I consider Altitude as a very stable and mature piece of software, I rarely ever feel the need (or even the want for that matter) to implement large changes. If there's a bug to be fixed, rest assured that it will be attended to - so as long as it's reported properly!
Further addressing the concerns of a lack of updates - it's quite normal for good software and hardware not to receive updates for extended periods of time. Just look at the Virus TI - although it hasn't been updated in several years (also feeling very unsupported in recent years) and people have their issues with it, many producers and sound designers STILL hold it in high regard and use the synth every day in their work. As a professional producer and sound designer, I could get by with Altitude as my sole synth with not only confidence but comfort as well. Its workflow speed and flexibility are quite unmatched in my opinion. You won't be disappointed with the investment.