I have a pair of 6100's (one has the DOS card) and a pair of 7100 (7100/66). If you do not need Nubus slots I say go with the 6100 with PDS video. For some reason I don't care for the 7100 case design. One of the 7100's has a G3 card with PDS passthrough, works well except that the onboard SCSI is so slow that running OS 9 even with a G3 is too slow. Great for system 7.6.1.

I would take a 8100 over either (or my 81/110 Radius).