All of these emulative synths come as close as
you want them to be.....but the reality is if you were to make a direct comparison then you'd immediately hear the flaws/differences.
In my opinion....if you are true to yourself and a passionate synthesist.....you will save up the money....make a few sacrificies.....and buy the real thing.
Companies these days post audio clips on the net comparing their product to the real thing. But they always use generic sounds (hmm....a sawtooth with a bit of filter) and post it as a dynamic crushing MP3. Try listening to proper wav. files and you'll hear the difference. Im sure companies could post wav. files.....but they dont
Its entirely upto. Nothing sounds like a 303 except a true analog 303. That is the plain truth. Rather than looking at an emulation that apparently gets 75% of the way there....try looking at it as the 25% that will never get there
DS