>I'm a Japanese student.I'm sorry that my English may be a little strange.Black saturn is the first type(1994.11.24 in Japan).White saturn is the second type(1995.7.? in Japan).Both of fanctions are same.In Japan Black one costed \44800(about 448$),White one costs \20000(about 200$).White one aimes at broadening,I think.
V-Saturn has same fanction of sega saturn,but this is not made by sega but made by Victor.Co.Different thing is only design.
H-Saturn is made by HITACHI.Co.This has different fanction.I don't know accuretely but it can play MPEG.