You buy it! than you start looking for apps in the andriod market place and realize the apple apps are so much better and aready paid for.
This is the thing. Unlike a desktop or laptop which is a big investment, tablets are more likely to be replaced - on a yearly, or bi-yearly basis.
However, who in their right mind is going to spend a few hundred quid on iOS apps only to abandon them and start afresh with Android? And vice versa.