It's not by choice (I'm using because it's probably one of the best values for your money synth wise but I'd prob rather use Massive or Serum to be honest) but I've been using KV331 Synthmaster a ton recently. I picked it up for I think $30 through both the academic discount and the 50% Black Friday deal but even then it's worth the $60 for the regular academic license.
I'll say this..... It does A LOT of different types of stuff. Hell I barely even use the non subtractive and wavetable stuff in it and I'm still impressed with the sheer amount of stuff packed into it. What I don't like is the user interface, which I've gotten used to but is seriously not really all that good. It's easily the biggest weakness with the thing and why I'm guessing more people aren't using it. Assigning modulation is pretty bad since you have to go through a very un-intuitive mod matrix rather than just dragging the mods like Massive or Serum, and other factors like the 2 different types of LFOs and Envelopes (you've have 4 LFOs and 4 Envelopes for each of the 2 Layers (2 OSCs each) AND 4 LFOs that are global but you can assign LFOs from either layer so it's basically 12 global LFOs arranged ass-backwardsly)
If you wanna get one synth for cheapsies or are just looking for an extremely versatile synth (a modular or something like Zebra2 will have more but those aren't cheap) , it's easily the one to get by far, but be prepared to wrangle with a very confusing interface.