i've always thought that pure sound sources, like a classical guitar, should have a great room to record in.
and then, the 'room' sound, should be natural, like you say bit.
but, if you are looking for EFFECT....
a plate, very mildly used, seems to have more 'sheen' to it, than a room verb.
in other words, go for natural room reverb...with a room mic.....
or go big, with a fake plate.
heheh