Android is much better in terms of usability and application diversity
Symbian S60 is quite outdated, and in some respects easier to use but many people don't consider phones running S60 smartphones anymore because of it's technical limitations. Secondly the face of Symbian hasn't changed much in the last decade.
That said there are some good phones that run the S60 OS (for example the E71, E5 etc)
but touch screen phones running this OS have terrible user interfaces. Nokia is dumping the S60 OS and in the future is making all mainstream phones using a newer, Symbian^3 operating system. Time will tell if it is a success.
If you want a touchscreen phone, you should get an Android mobile phone.