I have been playing tabletop RPG's for close to 15 years now, I have Played/GM'd AD&D,D&D 3.5, Aberrant, Vampire, Legend of the Five Rings, SLA Industries, Shadowrun, Over the Edge, Trinity, Mage, Shattered Dreams, Marvel Superheroes, Golden Heroes, Rifts, CoC, Pendragon, Kult, Feng Shui, DC Superheroes, All FLesh Must Be Eaten, Inomine, Streetfighter 2 to name but a few!
I am also an avid PC and Console gamer (yes, uber nerd!). I think computer games have their place, but have to agree with Dustinzgirl, that the computer game is killing off an outlet for true imagination. Before I start getting flamed, let me back this up.
Computer games have some of the best storylines and immersion techiniques, but it is a very solo affair. Even with the MMORPG's where you are sharing an experience with loads of other players, you are usually alone at home on the PC or Console.
Now with a tabletop RPG, you not only get the complete freedom of inventing your character at the outset, you get to affect the world in any way you want. Your only limit is your imagination.
Computers improve hand eye co-ordination, which is great, but temper it with a tabletop game to improve your problem solving, co-operative and strategy skills. I can honestly say that tabletop had such a positive effect on myself and many people I know, encouraging them to use skills they had IRL.
However, this is a debate that will remain unanswered I think. A good mix of both would be an ideal world, but as computers dont need any organising, prepping ahead of time or friends available on a certain night at a certain time, that computers will be the popular choice for most.