The SCSI interface on the Blizzard will be faster, because it can access the 32-bit memory on the accelerator via DMA (Direct Memory Access). The GVP card is a Zorro-II card and can only access the 16-bit memory on itself and other ZII cards via DMA. If you use the GVP with memory on the Blizzard, the GVP SCSI interface will have to access it via the CPU, slowing the system down. However, if you plan to boot the computer into 68000 mode occasionally, for old games or whatever, you could keep the GVP, since the 32-bit memory on the Blizzard won't be available in 68000 mode (I think), only the 16-bit memory on the GVP.
/Martin
