Hey Barneys,
I think the usual fits i.e. depends on what you want to use it for and other devices you want to use in conjunction etc, etc.
Therefore, if you have an iPhone, iMac etc. go with the iPad. If you have an android version, I personally like to stick with the same brand, just for uniformity and communication.
I have a BlackBerry and therefore have a Playbook (same company). Hope this helps. NQTY