CI3 or CI4

CodeIgniter 4. CodeIgniter 3 is what you may consider to be quite antiquated by today's standards. CodeIgniter 4 should (hopefully) be releasing its first stable version by February 24th.

Why you ask?

- CodeIgniter 4 follows the trends of newer technology.

- It is easier to extend than CodeIgniter 3. Yeas in version 3 tou could use MY_Controller's and such, but extending CodeIgniter 4's services are far superior.

- Support for version 4 will last substantially longer. I forget how long version 3 will be supported but version 4 will be supported far longer into the future.

It is dar better to prepare for the future by using the newest iterations of the framework.

I hope this helps you decide

You're right. It's better to be prepared for the future. CI3 is good but in these days obsolete. Looked deeply in docs and It looks very good, I like it.