Personally I don't think the app store is really that "
much" better anymore, sure they have a more unified feel and are usually better optimised but android apps are now updating a fair bit so there is a better unified feel and most of the popular apps are all well optimised etc. If there are any problems (serious ones), the apps are usually fixed/updated with in a day or two.
Plus with all that new stuff for developers shown at google's i/o event, means we will see much better quality android apps now.
I also don't think stability is an issue these days with android
I never have to reboot my one S at all in order to fix problems etc., nothing ever crashes/freezes except for the odd 3rd party app (which is
very rare) and can't say I have seen anyone experiencing serious problems with the nexus 4 on 4.2.2, same with the GS 4 (latest update), HTC one.