I prefer MIPS to ARM for sure, because the assembler is much easier to understand and keep track of, the addressing modes are simpler and more flexible, and I love SGI hardware too. Since IRIX runs Big Endian too, there is little chance this board would be of any use, let alone the fact that IRIX is not source available or free.
MIPS is also quite fast for its clock speeds, but here RAM may be a limiter.
