I actually have a good mix of both. I have four hardware synths and many software synths, which make for a great combination for creating new sounds. Since I refuse to use stock synth sounds, I'm creating all my own and I have everything I need to do that, with the Oberheim Matrix 12
and Absynth serving as my primary sound creation tools. Both are trouble-free and very reliable and, with Midiquest as my editor/librarian, I can save and organize all my new sounds and quickly and easily recall them, making my old analog MIDI synths quite powerful.