I would go tablet. For work, a tablet is easier to navigate and is bigger so it's generally easier to work with and type on etc. Depending on the tablet, the processor will probably about the same as the Ipod or a bit under or over depending on what you get. It should still be fast enough for all your games.
Now, games.
Though there are less games on the Google Play market than on iTunes, it is a growing thing. A tablet will also provide more fuller game play due to a bigger screen.
I presume that if you get a tablet, it would be android like almost all of the tablets these days. This is a plus because you are not locked into the evils of iTunes.
That's my views on it anyway. Go for whatever you prefer.