I don't want to tell you that symbian is better than android,because I believe that generally it's not. I will describe my opinion:
I have a Nokia 5230 phone from first 2010,it's like 5800 without wifi and lower camera.but everything else is like 5800.
I found so many apps untill now for s60v5 for many cases. so many apps that do much more things than my expectations from symbian.
first I should tell that I have been upgraded my phones firmware about 4 times and now firmware version is 50.0.1.
these are some of the best apps I founded for s60v5:
1.Nokia Animation Creator:
thats a very amazing app that lets you create animations on your phone with finger gestures.
2.Caricaturer:
lets you take photo of any one and turn it to a caricature by finger gestures(Like the app in iPhone)
3.Handy Paint:
application that lets you paint on your phone with lots of options and responsive touch gestures.
4.IDesigner Touch:
a very advanced painting tool with so many options and very usefull tools for advanced painting on phone.
5.MP3 Cut:
lets you cut any song to desired length.
6
DF Scan:
lets you take photos upto 20 pages from a book and saves it as one PDF.
7.Picsel Smart Office:
really amazing app for viewing and editing office documents even office 2010 and viewing PDF files with lots of editing tools even fonts with a high quality full touch UI.
also if you install Qt on your phone there is a huge number of useful and powerful Qt apps for symbian like:
1.Dj Turn Table:
lets you mix songs with drums on the Dj Table.
2.Heart Beat Counter:
determines heart beat count using camera from color changes of your skin.
3.Nokia Loop:
lets you overlay up to 4 different sound tracks over each other and mix them together.
I only Mentioned Top apps that I remember now.
but I should say that I have about 700 MB of tested apps for s60v5 that can use for different needs.
So I said all that but not to prove Symbian advantages on Android. because there is so much apps for android that do above things. but there is one consideration:
Android is good,and is better much more than symbian IF you can pay for a good android phone not a cheap one. because android on cheap phones is much trouble. in fact according to how much you can pay for a phone,you should make true decision,I give you an example:
I can buy HTC wildfire with android 2.1 about 260 USD(in my country)
but HTC wildfire has a 320 X 240 resolution thats like a joke for an android either not android phone now a day. when you install useful android apps on it, and run them, you see that texts and images are double sized on the screen and its hard to do working easily or surfing the web with ex. Opera Mobile because you see only 6 lines of a page on the screen.
whereas on almost any s60v5 device you have 640 X 360 resolution that is amazing to work with. so I said these to tell you that it's depending on your money to make decision about OS type, really if I would have 200 USD, I would bought a s60v5(5230) phone again, but with 400 USD I never think about symbian. so my next phone is an android phone but a good android phone to take advantages of android. not only to have an android phone in my pocket that's hard to work with it.