Re: Which one of this hardware synths
For a start, the Minilogue and the BS 2 are not virtual analogue. They're actual analogue.
These two in particular are going to get you very organic, retro sounds, which will not sound like contemporary EDM type sounds. They'll sound more raw. The Gaia is going to sound most "plastic" out of all of them, very digital-sounding. Which is fine if that's what you want. I haven't tried an Aira. . . but at a guess it has the most potential for "contemporary" synth sounds.