If you want to know who'll best tackle unemployment, compare candidates' skill sets, not economic data from their pasts
Had Mitt Romney, Jon Huntsman, Herman Cain, Ron Paul, or Gary Johnson run Texas for the last 10 years, they'd likely have created just as many jobs as Rick Perry. This is partly because when Perry became governor, "taxes were already low, regulations were light, and test scores were on their way up," as Ross Douthat puts it. "He didn't create the zoning rules that keep Texas real estate affordable, or the strict lending requirements that minimized the state's housing bubble. Over all, the Texas model looks like something he inherited rather than a system he built."
But it's also because Romney, Huntsman, Cain, Paul and Johnson are all earnest advocates for business-friendly jurisdictions. It's one issue where the whole GOP field is in basic agreement with one another.
Had Rick Perry been governor of Massachusetts, his job creation record would look a lot different, even if he did his utmost to implement the same policies. The legislature would've thwarted him. Voters would've opposed him. The culture there is different. The economic climate is different. The natural resources are different. The population density and settlement patterns are different. It makes no sense to compare the Perry and Romney records on job creation.