Well software has been able to recreate analog sound sine 1997 when I started working seriously with computer mudic. The problem back then was that in order to make a faithful emulation that would need quite a lot of processing power. But back then I had a 200 mhz Pentium , nowdays I have a 3.4 Quad Core. Modern soft synths sound quality wise can dance around analogy synths , in depth , quality and versatility. Not to exclude the fact that software updates can practically fundamental change the synthesizer or offer amazing new features. The edge for vintage analogue synths was the fact that they offer more hand on control but with the wealth of midi controls that come with a wide array of presets support many software synths its still not much of a good reason to pick a hardware synth. Hence why software has practically monopolised audio synthesis lately. Thor in Reason can easily compete with my Alesis Andromeda A6 , the most powerful non modular analogue to ever exist. When it comes to modular synths, software reign supreme, while hardware users have to battle with the terror of the spaghetti monster. Nowdays going down the hardware synth lane is purely a personal taste choice.