GSP has the more explosive double leg. Jones is way better in the clinch. Overall I think Jones is better. It's marginal.
Jones uses his height as leverage a lot in the clinch, and we'll it's very effective against guys like DC, Chael, and Rashad, who are shorter, its extremely ineffective against taller fighters like Santos, Gus, Smith.
GSP never faced an opponent he couldn't take down, Jones can't say the same.