I think the android market needs to improve a LOT before android tablets will really take on apple. The app store has many cool and fun games that run really nice and smooth. The android market place has much fewer of these good games, and the ones that have been ported over run quite poorly.
I agree with posters above that in 1-2 years android will be polish, developers will be releasing apps for both at around the same time, and then things will get much stiffer for apple.
If your intention is to use the tablet as a toy. But I don't play games on my iPad or my android phone.