I haven't tried X3. So long as I'm enjoying the simpler version I will stick with that. Besides I have to get through NWN2 before I start buying other stuff!
I think the thing I like best about X2 is that it can be played as so many things. I can sit in a space station running my trade empire. I can sit in a carrier (OK it takes a while to save up and buy one), and run a war. I can act liek a taxi driver. I can jump in a fighter and bally well charge into the foe, shouting things like "I'm going to make the skies safe for mumsy and daddy and Buckingham. Hurrah!" I can even start a pirate kingdom and start my own private wars with the mainstream empires.
*happy sigh*
The Saitek cyborg is, incidentally, just awesome. I didn't realise, but it has all these buttons on it, and you can map them to keyboard and mouse commands, which greatly improves playing something like X2. For example, I have your regular fire weapons, change weapons, tactical map on the joystick. But I also have my trading screens, message board, and universe map on there as well. Allowing me to check the market prices while I execute long banking turns in my destroyer.
Speaking of destroyers it is worth mentioning the capital ship combat. There is a fair variety of different ships, and a large variety of weapon loadouts suitable for different prey. But fighting with a capital ship requires real finesse. You can't expect to take on serious opponents with simply a winning smile. You need to learn all the overlapping patterns of fire on your vessel and maximise these in conjunction with the rights instructions to each bloody turret, and I'm tod you can hire gun crews as well. Serious brainache combined with righteous fury. My biggest problem is that I'm not used to flying such a big ship as my new destroyer and keep ramming things accidentally.