CnP wrote:Hmm. I can study (review game records), & do problems on my galaxy s3. I'm not sure about content creation, as I don't do that (and would use my desktop if I did). KGS is only on Android but the html client is going to happen soon anyway. Like lobotommy said you need ios if you want SmartGo but if you've already got a lot of books that might not be important (I borrowed a friends iPad and wasn't that impressed or rather its nice enough but I don't miss the temptation to buy all the books I already have a 2nd time

).
I can assure you that buying books via SmartGo is 100% times better than buying a paper ones

. Cheaper, always with you, interactive, instant access to new published books and to the out of print titles, and last but not least - no shipment costs.
Sure you can study and review games on Android, however I think there is still (were?) a significant gap between go tools on iOS and Android - in both quantity of the apps and their quality.
For playing games it is almost the same: WBaduk, IGS, Tygem, plus all correspondence based servers. KGS (desktop version, not mobile) is also available via third party apps.
As for the quality apps we've got "Three Crows" here on iOS:
SmartGo Kifu with over 73 000 pro games with Joseph/fuseki search, plus great interactive book view option.
EasyGo - fuseki search, internal webrowser for easy access to games on web, great tools for tsumego collections/creating and great training tool because of implementation of some interval training method, I don't remember exactly how it is called.
GoEye - go4go integration, PDF creating, picture to sgf feature, and quite interesting way of presenting variations.
So this is a crucial moment, when one should think twice about his OS platform. And a number of tsumego apps which are "iOS only" - is just overwhelming.
In my experience I have not found any Android app which was close to SmartGo, EasyGo or GoEye in terms of usability and features - but currently I don't have any android device to verify my-one-year-old experience, and I'm aware that things are changing fast so who knows, maybe there are some killer apps I'm not informed about.
Maybe the best option for the future will be an android phone and Apple's iPad

but for now, as far as I know, iOS rules in the go apps area.