We got the Nexus 7 when it first came out, and have sold it to either get the Nexus 7 3g or iPad Mini-- Like chary, for us(him) it's also the size factor.
I asked the OtherHalf about this (he's obsessed with technology), and he said "Get rid of the Galaxy Tab. Nexus all the way!" He did play around on the Nexus 10 when it arrived at his work, and said it was a lovely fluid experience, but wasn't the prettiest. He says the specs on the Nexus 10 will remain unbeaten for a while, and for the price, it's fantastic. If you don't want an iPad, this is the next best thing. With that last comment, he's referring to the whole experience, but seemed to specifically mention app availability being better on iPads.
Not sure if it helps to know that his review is pretty unbiased--we're pretty neutral when it comes to the whole Android/PC vs. iOS/Mac issue, as our gadgets are equally distributed across both.