1. Actually the fact is both stores have circa 600k apps.
2. Quality is very subjective.
Whilst quality is subjective to you, the fact remains that the App Store gets higher quality apps from top developers either first or simply at all.
And again, look at the example of Horn. Released on iOS first, works with a two year old device (iPhone 4) yet when it came to Android last week there were forums full of complaints at the limited number of devices which support it, including the Galaxy S2, which is "younger" than the iPhone 4 is it not?
Now, again my use will vary to yours, but whether you play Infinity Blade or not is irrelevant to the point that top apps from top developers go to iOS either first or exclusively.
Personally, I have spent far too much money on apps to ever walk away from iOS, not that I'm looking to. Titles like Infinity Blade II, Soul Calibur, DoDonPachi, the Final Fantasy series, the Sky TV apps (which come to Android eventually, AGAIN only supporting certain and few devices), the iLife apps ... just some examples of my own use and all top quality apps from top developers. If you don't play games often then the impact is obviously less, but there are still some examples (such as Sky TV) which simply excel on iOS, buying you're not a UK user or Sky customer, it is again as you say, subjective.