It is really what you want, that matters here. I own gamestudio pro and torque + a bunch of addons, I have used genisis11 and hammer, and before it was called that, worldcraft, the starcraft and warcraft3 map editors, quake2 and 3 modding, ect.

They are all good in one major way or another for learning to be a game designer. Anywhere from learning to design maps/chars/campaigns to selling games.

For making and selling your own game, I would choose gamestudio. Unless its a multiplayer project, then I think I would advise torque. But only for the multiplayer, if your project is single player, no question, I would go gamestudio.