It's a matter of personal preference. I like the cleaner patterns with less speckling, which is why I went with my hypo/hog. That and my guy has MUCH brighter orange colors than most pure hogs I see. Just look at a bunch of pictures and decide what you find more attractive, then look for a specific animal that fits what you like...
Here are some links to PMHerps. The first is pure hog, the second are his hypo/hog crosses...
http://pmherps.com/sub/hog.html
http://pmherps.com/sub/hypohog.html