Yeah, I like the acoustic guitar and fretless bass too.
Funny thing is that I own both instruments - my acoustic is a nice mid-level Takamine - but if I can get away with it, I tend to track with the live instrument until I get the idea right and then duplicate the track in MIDI using the corresponding VST. Their recording techniques when sampling always yields a better result than when I play it live; plus, it’s cleaner too, and I can edit it later if I want to modify the bass line, transpose, etc.