simultaneous:
All orders are given and then carried out. Laying Sats., mines and loading transports along with fighters, are not open to mixing and managing their content. The computer will load a transport with no reguard to type or size of the units. So if you wanted to mix Armor with Infantry you could not specify the mix. If you wanted to lay Sat's out with say 1 Sensor and 49 Defense sat's, you'd have to load the exact amount in the transport.
Movement is carried out with certain functions being regulated to the AI as far as reaction goes. A ship given an attack order will do it's best to attack the target. A specific target must be specified. Battles are all run by the computer, so you will have to designate strategies to the AI to run for you.
Turn Based:
Lets you customize your loadouts and you can unload 1 unit at a time or launch. Since no other ships will be moving, you can bypass ships/fleets you don't want to engage. You can fight your tactical battles which gives you a huge advantage over the AI.
These are just a few of the differences. There are many more that I will let you find on your own. That's the best way to learn!!!
