Why was CodeIgniter choosen? There was a discussion and reasons why CI was choosen from the big pond of frameworks.
The coredevelopers / most active developers should tell us what each of them would favour. Or what was the ranking the last time where CI was on first place?
Beside the most common picks I want to suggest a deeper look at the CMFs.
ModX GPL
modxcms.com/about/license.html
Flow3 LGPL (Discussion to change to MIT)
flow3.typo3.org/
Choosing a framework is a bet on the future. E.g. Flow3 will be part of the Typo3 Movement.
For me the scenarios are:
1.) What happens when the company/community behind the framework changes the license?
2.) How many GPL-Projects use the framework?
3.) What is the biggest project (in terms of user, commercial users, installations etc) using that framework?
Just post a list of every active developer of the last 12-24months and let each choose a framework. Show us the list as a ranking. Let the users give feedback of pro/contra.
The problem is to really know a framework. If you are not already using the framework you will need a lot of energy to dig into the framework.
IMHO only Developers can answer the framework question.
Perhaps choose a Framework which name doesn't start with an "C":
CakePHP
CodeIgniter
What's next?