spetznaz
Senior Fanboy Killer
Batman ....and let me explain why.
For one, in the physical aspect Batman is far superior (both in fighting ability as well as physique). While Mr. Terrific can lay the smackdown on your typical group of perps, Batman simply is better.
On the mental note they fill more or less the same role in their respective organizations (the JSA and the JLA), with each being the chief strategist and tactician in their respective positions. However, Batman has had higher feats in both tactics and strategy, although this could simply be due to greater writer focus on Batman (being one of the major DC characters) than on Terrific. I am certain that if Terrific got his monthly issue (or maybe a limited series like Richard Dragon got), then you would see some MAJOR level prep/stratagem/tactics (the guy is said to be the third smartest man in the world).
When it comes to technology Terrific has some really cool gadgets, which are so cool that Batman has 'borrowed' some of them. For instance during the JLA: Obsidian arc, Batman 'took' the T-Sphere technology from Terrific. Also note that during the Brother Eye arc the only character who could not be tracked was Terrific (he was absolutely invisible to all sorts of technology).
Anyways, the definitive answer can be derived by noting Terrific's reaction when he realized that Batman had 'taken' his T-Sphere technology ....the guy was basically so amazed he almost seemed like he would explode with joy.
That level of worship is only reserved for one's superiors .....Batman wins.
With that said, if writers gave Terrific a 10th of the time given to Batman, you would probably see some high level prep. Maybe not to the same level as Bats, but still bl@@dy impressive nonetheless.