I understand why Propellerheads don't want to support VSTs in Reason. As soon as they do that, they are no longer in control of the software and pretty soon people will complain about it crashing all the time etc. Reason is designed for creating electronic/dance music, a lot VSTs aren't build for that purpose – square pegs, round holes, blah blah blah...
Cubase (like Logic, Protools etc) is an all-rounder, you can use it for any kind of music/sound production. I would say it's not all that user-friendly for what I do, but it's what I'm used to now. I should have learnt Ableton Live –*I see that as the crossover between Reason and VST-compatible DAWs.