Should i upgrade my iphone 4 to ios 7 or ios 6.1.3 is beter for it?

Will it work smooth like 6.1.3 version on my iphone 4

Look for bb messenger now it's available for ios and android

Definitely you should upgrade because apple is going to release some apps which works only with iPhone having ios7 also belive me you will have a better user interface… It might not be as smooth as ios6 but it will be fixed. And enjoy experience of ios7…

I hate it. My phone is much slower and I don't care for the graphics. Texts are harder to read and the Apps look weird. My friend likes it but I wish I never upgraded.