Bill, the 95 has a smaller footprint, and reads SMF's from a disk drive[floppy]..It also can read styles from the floppy..The RA90 used cards for additional styles , and a Super card[15 cards in one]..The RA95 is more practical..
The RA90 has neat controls over the drums[parameters for different sounds]...Over all I would go with the RA95 ..considering your two choices..