The stereo-types are:
Vintage: fat, warm, bassy, woolly, feel the notes more than you hear them, boomy, more bass than mids or top, what they sounded like in old fashioned times. Ampeg.
Hi-Fi: not so fat, not so warm, bassy, clear, defined, hear every note, middy, more low mids rather than low bass. EBS.
There is also a middle ground, which is my sound. A combination of all the good bits and none of the bad bits. Bergantino.