Turn-based strategy that moves so quickly, you'll forget it's TBS.
As I said, I don't much enjoy TBS today, but Moonbase Commander is a gem of an exception. Thought it's getting up there in age, it has a simplicity and uniqueness of design that makes it worthwhile for strategy fans to give it a spin.
The first thing you'll no doubt notice is the game has no graphic resolution options: It runs in 640 x 480, but it's colorful and looks nice for a game of its age. Narration is performed by a soothing Asian-sounding female voiceover. You can select from different factions, each with a unique look and GUI, but identically-capable units. There is no over-powered faction as they are all the same. You start each round of play with a certain number of energy points which allow you to create hubs, shields, towers, air defense, energy emplacements, etc., as well as launch various weapons: bombs, missiles, crawlers, EMP, etc. You may skip using all your energy points in any round and they will carry over to your next round. You start with a single hub which you use to expand your lunar base. All structures you build must be connected to one another via tubes. You hub allows various launching directions around a 360-degree perimeter. You choose the amount of power you launch a structure with which determines how far it travels. You have to be careful not to land it on or across uneven surfaces or it will be instantly destroyed. If successful, the structure will build a tube back to the hub from which it was launched. Expansion continues in this fashion. You must plan carefully due to the terrain and the fact that you cannot cross a tube that connects any of your structures. As it states in my "Classification" option, it's a bit hard to describe, but you'll catch on easily once into the game.
The energy points you get in each round can be augmented by building energy collectors on one of the randomly placed energy pools on a map. they appear as a light purple water pool about the size of a hub. In order to collect from it, you must launch an energy collector directly onto the pool. This will increase the amount of energy earned in each round, giving you more expansion and attack capabilities. Just remember that there must be clear flat terrain back to the hub from the collector.
You can build shield structures that place a bluish dome over structures to help protect from air attacks. You can build anti-air structures to shoot down incoming missiles. To counter shields, you can build "Crawlers", autonomous land vehicles that will move a certain distance toward the enemy's base in each round. Crawlers can penetrate and take out shield structures. You can also launch EMP devices that temporarily cripple enemy defenses. You can launch spy balloons that uncover the "fog of war" nearby that unit. There are many different tactics to use.
Another thing to keep in mind is that the maps are wrap-around at the edges. This can allow for interesting tactical maneuvers, as you could launch a missile toward the West side of the map and hit the enemy on the East side. If you destroyed a structure and cut off other structures from a hub, it will destroy them all in a chain reaction effect.
This game was good enough that someone actually wrote a nice multi-player utility called Moonbase Console. This allows you to play against others online and adjust the game's parameters. If you can't locate it, drop me a line. I may be able to get you a link.
Though Moonbase Commander is obviously not the graphic nor tactical equivalent to something like Supreme Commander, it does hold its own in the strategic arena and does so with a colorful simplicity that you don't often find.