I had the Coyote ForteDXi for a long while, and the VSC DXi, and also the Synth of the Audigy (quite good indeed),.

But since I got the external Yamaha MU-100, I don't use them any more.

Hadware synths are hard to beat in many other ways not mentioned here. You can play them without a computer in performance, you can feed them from any MIDI source easily, they haver overall good sounds, they can readily layer sounds to get fat ones out, PLUS, they are GREAT for external connectivity, such as sending them to external mixers, allow monitor outside, control their volume levels indeendently with physicl knobs quickly, most have several inputs and outputs, earphone jacks, and even their very own reliable little screens where you can see what's going on on each channel. I can also hook other midi controls to drive it bypassing software playing, even a second player can be playing it with another separate keyboard he/she without going through a computer, I can play bass with the MIDI pedals directly into it too.

Dollar pe dollar, I would say that one gets more with the hardware one than from a software one.