Vortex Sound Research

Hi there! I've been looking at a few different synth desktop modules (Blofeld, Minilogue XD, a few Volca's) and was wondering what midi controllers are the most popular. I think I'm a bit of a outlier in that I'd want a 49 or even 61 key controller instead of a 37 key one (but I would totally be okay with a good 37 key one providing it had, say, a built in arpeggiator or something).

Also, is there a good way to swap between, say, the Blofeld and the XD or between the different Volca's once I have them all on a rack? Like a way that instead of plugging/unplugging a Midi cable I could have a sort of switcher box set up? Just curious. Thanks!