Depends on what is more important to you, the "look at me" felling or the "Mine does the same but cost £100's less".
I personally only own 2 ipod's no other apple equipment. The Google Market has 100K's of software for free on it, don't know about the apple one. You can't put any other f/w on an apple but the Android tablets have a blossoming mod market (all free).
If you want a device to surf/view the odd video/utube and are not itn the first case above then get an android tablet.
There are 2 main types of device, resistive & capacitative screens the latter are better and a more expensive (generally £200+ tablets). You want at least a 1Ghz processor and the amount of on board ram is up to you as they all take sdcards.
7" are fine for general use, but if you want to read magazines the 10" would be better, but more cumbersome,
For me I spent my xmas money on a 7" 2Gb resistive one (£50) I is a bit slower (800MHz) than I wanted but the price was right, for what I want it for this will be fine (email and odd web page).