The most shocking thing on the Suns back then compared to the SGIs was the mouse movement. While the SGIs had a smooth movement, Suns mouse ended up jumping dozens of pixels between refreshes.
Suns were not really designed for desktop use - they more or less aimed for the generic case. SGIs, however, were built to be experienced.
I remember the first time I used a Sun Workstation. From a PC background, I was impressed by the fact that the keyboard housed the beeper, the keyboard was a serial device and the bios equivalent had a built-in command line.
It is a shame that such a small set of features jumped from workstations to the PC.
Suns were not really designed for desktop use - they more or less aimed for the generic case. SGIs, however, were built to be experienced.