@doctor_alchemist: Nope...how the hell will they catch a Space Ship that can teleport through space? Even if he doesn't time travel...they have no way of catching him...You would have to give them someone with Cosmic Awareness to track down the Doctor.
Their base, Knowhere, has a teleporter that can go anywhere in the universe. Not that it'd be much use in tracking him, but if they knew where he was going without time travel, they could keep up.
Thanos is easily more manipulative. Not to mention he's at least a few decades older than Reed, grew up on a much more advanced planet, and has some of the most hands-on experience with cosmic stuff of anyone in 616.
But Reed is more curious, always learning new things. Thanos is generally content with using what he already knows, only learning new things to suit a specific goal. He's incredibly smart, but doesn't always tap into his full potential.
As though smoldering testosterone t'was poured forth from the loins of a Norseman, unto a mold cast from the rock of a god's dying chord, feast thine virgin eyes upon the most masculine thing mankind hath ever wrought.