I found this post published by Redmond Pie site. According to them (Redmond Pie editors team), iOS (then known as iPhone OS) was revealed alongside the original iPhone back in 2007. Apple called it the most advanced mobile operating system and claimed that iOS+iPhone was 5 years ahead of anything else available in the market. Since then, we have seen four major
updates, each of which added one highly demanded feature or another.
Today, iOS 5 is one of the most feature complete mobile OSes available.
It was released on October 12th. Well I updated my iPod 3G to iOS 5 just last week and found there are quite a number of new features or application being added to the new iOS update. of course since mine is only an iPod experience the new features available will not be possible unless I have an iPhone. Anywaylets have a look on their next comparison in the list below.
was actually unveiled in 2007 as well, but was launched only in 2008 with the HTC
Dream (aka T-Mobile G1). It is considered to be the most
rapidly-developing and feature-complete OS of the bunch, but because of
its focus on features, the OS has been lacking in the user-experience
department. However, its upcoming release – Android 4.0 Ice Cream
Sandwich – is expected to offer a vastly improved experience as
Google claims that design and UX was a primary focus during
development. Android 4.0 Ice Cream Sandwich which already available in the market along with Galaxy Nexus.
Lastly, there is Windows Phone 7. It was announced last year and is said to be the ‘spiritual’ successor
to Windows Mobile. Its initial release had limited features, but
Windows Phone 7.5 Mango – which was released ofew weeks ago – makes up
for most of the limitations. WP7 isn’t as popular as iOS or Android, but
its popularity is expected to shoot up exponentially once mobile phone giant Nokia starts pumping out their WP7-based smartphones.
To summarized all the above in one single table, lets see now which OS is the best among the best...
Feature-wise, though, they have readied the table you see above which,
well, compares one OS’ features against another’s. So I guess it's up to you to decide which OS is most feature-complete.