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at least if narrowed to one or a class - folks can point you to a specific dedicated HW or SW solution that duplicates that one "class" of sounds really well. If you mean you ALMOST never use a MIDI instrument - then it's a matter of WHICH or what type/class (brass, strings, chromatic, etc.) of MIDI instrument you do use infrequently and need to sound "realistic." If only MIDI piano than you don’t need a full "spectrum" synth or even a GM synth you just need a really good dedicated piano plug-in or an external HW synth that has a really good piano. If you are saying you ONLY use real styles that have zero (zip, nada, zilch) MIDI in them (no MIDI drums, no MIDI guitars, no MIDI pianos, no MIDI strings, horns, reeds, organs, vibes, etc.) than it is immaterial if you have ANY MIDI synths whether virtual (software plug-ins Like the Coyote Forte ) or actual (like the SD-50) and irrespective of cost: free, cheap, expensive, or astronomical.
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That aside, and I don't mean to be rude but your basic question (and it's been asked by almost every new person to computer music) is analogous to asking which is better a golf club or a cheese bagel to fly an airplane. But if you have ANY Roland synth gear that has an RS-232 (serial) interface I'm sure it ALSO had 5 Pin DIN MIDI? So you can still trigger it over MIDI from any OS: DOS up to current Windows 10 and from most any (all) Mac's.
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Roland VC-50? is that a sound module? I can't find anything on a SYNTH module called a VC-50 (there is a video field convertor but that's a differ animal).