It's even more sub-divided than that... It's really fragmented.
On the hardware side you have people that want something they will deem as "classic enough". Basically it at least needs to be 68k, possibly with PPC card, and various extents of modern expansions (some of which may not leave much of the original machine in actual use...)
You also have a number of people who care about the architecture for various reasons, but don't care about the actual hardware. There you'll find a number of FPGA projects. There is some overlap here, though.
Then you have the PPC crowd which is split between MorphOS and OS4. OS4 users has been A-Eons primary market given that they are selling actual new PPC hardware (with a second design underway), though they've lately started adding more products for classics, and have been courting MorphOS people too. MorphOS runs on various second-hand PPC hardware.
Then as you say there's the people who are fine with emulation.
Then you have AROS, which is largely hardware agnostic (ports to ARM, PPC, 68k, x86).
Within this there really are a lot of different motivations. E.g. you find classic users who just want to play games, but there are also hardcore classic users who try to use classic Amigas as their main computers.