I compared my TR-08 and TR-09 ACB sounds (which the TR-8s uses) to the Rytm analog machines, no contest, the ACB sounds despite not being analog, have much more presence in the kicks, toms, claps, rim shots and snares than the AR, the AR fares more or less equivalent or better for hats and cymbals though.
I do not know about the sample side though as I don’t have an 8s, but I’d imagine the AR probably holds its own or may even be better. I have not yet experimented with loading ACB samples into the Rytm as transfer does not work with mkI and C6 does not work very well.