All I know is the 848 has the smaller axle, the 1098 has the larger one, 1098 works, 848 is much harder. The 848 (I think) is the smaller axle from the older 916/996 series, so may work with a triumph hub. I didn't choose 1098 from research, I just wanted 6 inches of forged alloy goodness and got lucky.
And I have seen complete 1098 swingarm/hub/caliper/sprocket, for $300 aus. As in, everything except the wheel.
Don't forget, the 1098S is forged, so even lighter
what are the differences in the 5th/6th/8th gen swingarms? I've notice a few lightweight wheel discussions going on..