MHz ist not everything. For example the 68060 is twice as fast as a 68040 at the same MHz.
The Blizzard is just the highest quality design. Apollo and Viper are rather cheap in comparison.
Other factors might be important, too. For example accelerators with a maximum of 8 MB RAM usually deactivate the PCMCIA slot when fully populated while accelerators which can take more then 8 MB don't.
Bye,
Thomas
