It would depend on your budget and intended usage, primarily.
If you have any other iDevices such as iPods or iPhones up to 4S, the iPad 2 is compatible with accessories, as it still has the 30 pin dock connector. All other current models have the new port, as does the iPhone 5.
The iPad 2 does have limited storage. It is only available now withe 16 Gb, and that may not be enough if you are a gamer. Some apps are now running at over 1Gb.
The mini is finding favor with some, due to it being more comfortable to hold for long periods of time, but it's smaller screen also has some disadvantages.
At the end of the day. The best bet is to go into the Apple Store and play, and see what you are most comfortable with.