Both are great boots. I can only speak firsthand about the Booters, but my cousin has SPKs and he loves them.
I know that they are both good boots, and the Booters have not disappointed me at all. They are light, perform well, and have held up great! No need for new heel piece after 1 season (about 45 days).
I guess it comes down to which you like better and price.
(Assuming they both fit your feet well)
Although, I don't know how they can both fit your feet well because the booters are 102 wide, and the SPKs are 104.