Trilarion: RTS is always more about tactics. I loved Dune 2000 in the good old times. You have to think fast. Sometimes this adds to the experience, most of the times it's nothing for me. TBS* is about strategy, less tactics. You are supposed to think several turns ahead, to thoroughly analyze the situation. It's more to my taste, because I like to have time. But occasionally I even play action games.
*I regard RTS with a pause function where you can apply changes (e.g. HoI) or where you can slow down the game speed to really slow as equal to TBS.
This is mostly true. There is one main exception to the RTS being more about tactics, and those are the grand strategy games by Paradox. These are the only real time games that I have played that are purely strategy, since they focus running an entire nation, from policy and economy to the military. War is kept at the strategic level as your control is limited to telling your armies where to go. Any battles are resolved by the computer. As far as speed, there are multiple settings and it can be changed in game on the fly. I usually have the games set to max speed during times of peace, but slow it down to slow during wars and pause when an event pops so I can think about how to respond.
I do generally enjoy TBS and TBT (turn based tactics) games more. I like being able to analyze the situation each turn. For TBS, I really enjoyed Alpha Centauri (still need to reaquire), Civ 2 and Civ 5. For TBT, the X-Com and Jagged Alliance games were fun.
I also like games that combine RTS and TBS/TBT elements. X-com does this by having the world view as an RTS where you recruit and equip your soldiers and research in real time and then switch to turn based for the tactics part when in combat. Lords of the Realm flips the two, using the turn based mechanics for the strategy part of the game and real-time for the battles.
As a note, I define strategy games as games where your focus is more on the logistics than the combat. So things like running your economy, directing research and building your forces are what constitutes strategy. Most of the decisions for these activities are made to progress towards a long term goal, such as achieving a certain tech level, or eliminating a certain opponent. Tactics, I define as games that focus more on combat and directing troops actions in combat. Here, the decisions are almost always made to react to the current situation.