Ah now you see this is an interesting question, for me it depends if I know I won't be long on the toilet I'll play something quick like Jump Ultimate Stars, however if I can draw it out I'll play something long winded like the Ace Attorney series or FF3. For me there's no better place to play computer games sometimes I'll try and convince myself I have to use the loo if I want to play a game or read, one of the reason's I wanted a laptop was to use it while on the loo.
I have and will sit on the loo for hours if I get the chance.