I've had an android tablet (vega from Currys) for about a year and I find it excellent, I've upgraded it to Android 3.2 and do geeky things like controlling my MythTV system from it. It is useful to use when on holiday to keep an eye on things, there's an SSH terminal app and a Windows RDP client so I can even manage the servers, although a laptop is still better if there's a lot to do.
If you are happy with the out the box experience, then I'd guess it doesn't make much difference whether you go Apple or Android, if you want more control over the device, then Android will give you much more flexibility. Hardware wise, the newer Androids are more visually pleasing then the older ones and not a lot between them.
When I got mine, the Android SDK was free, Apple needed a developers license and I didn't fancy trying to learn Objective C when I already hat a little Java experience.