I suppose you could put organs into three categories:
Here we are not going to consider church organs which is highly specialized.
Up until few years ago home entertainment organs were very popular and were jam packed with ‘bells and whistles’. Although still available, the demand for these is somewhat waning, probably due to the fact that many of the the home entertainment keyboards have just as many ‘bells and whistles’ but are also much smaller and cheaper.
That leaves rock / jazz organs which are all ‘hi tech’ and have no unnecessary novelty features -
Historically the classic organs were the Hammond B3 and the original Vox continental -
But if you want the actual real sound of the Hammond -
Beyond these there are several dedicated emulations available.
So who are they good for?
Gigging or recording musicians. Possibly 60’s tribute bands or jazz.
I still love them!