having used both gingerbread and harmattan I have concluded to this: Harmattan feels at home when you come from Maemo 5. Now there are very few apps but I expect the wealth of apps to surpass that of Maemo 5. With the excellence of community support and the power of linux (thousands of lines of code waiting to be ported) the quality of apps should be high even if they are small in number. Qt components also help to keep the appearance and feel of applications consistent and nicer than their M5 counterparts. I have given a try to porting the WordPress app and it runs nicely on harmattan (unusable due to the lack of qtWidget but it should be usable without many modifications) and this should apply to all maemo 5 apps. Android on the other hand is more widely supported, more websites have android apps who use the api, but it is more closed down and requires rooting for even simple things like theming.