Realime captures weapon preparation time the best. Aiming, loading. Pistol vs sniper rifle, that sorta thing.
In TB it's mostly numbers, like tactical combat in Jagged Alliance and UFO/X-Com series. But furthermore, those games allow much more micromanaging of own troops (autopistol in right hand, grenade in left hand) than would be reasonably possible in most RTS games. Ok, Starfleet Command serie and the likes (Rules of Engagement serie) are exceptions, becouse friendly AI does its part.
Essentially, for a strategic or tactical military game, TB is more realistic, because real combat develops slowly over a period of days or hours...which so-called RT does not do justice to. Not to mention, we RT players don't have Real Time Staffs to assist us a real supreme commander would.
There are RTS games, where multiple people can play on same side (World in Conflict). Or in single player mode, player can assign some tasks for AI (Hearts of Iron, I think). In Starfleet Command and Rules of Engagement player is the Fleet Captain, and orders captains of other ships at his disposal to do stuff. There are even games which recognize voice commands, which could add good twist when those things start working properly.
I think my biggest problem with most RT/RTS games is, they haven't evolved, their still the same as the original Command and Conquer.
That's better than being stuck at level of Dune 2, or worse. Oh, and try out Total War serie and Supreme Commander
You know what they say, don't you? About how us MechWarriors are the modern knights, how warfare has become civilized now that we have to abide by conventions and rules of war. Don't believe it. MekWars