FWIW the new Gateways we just bought at work have ps/2 keyboard ports.
Having said that, I have Macs and PCs at home, so an I-pac was the way to go when I wanted a controller that would work on everything.
I think both companies make top notch products. When I get around to making my next cabinet, GGG offers a few things that I will be ordering for sure. Andy has some unique products too so, based on that and the positive experiences in the past I'll be an Ultimarc customer too.