Confused about what credit/point mod to buy

I am confused beacause of the broad mod product market of credits/points

Can you guys tell me the absolute best and most featurerich credit/point mod I should buy.

What are the difference?

Here are those that I found:

1) http://www.boonex.com/m/Ultimate_Points_With_Levels

2) http://www.boonex.com/m/Global_Points_System

3) http://www.boonex.com/m/Credits

4) http://www.boonex.com/m/Credits_system 


Wich to choose? 

I have had a nightmare with this. problem being - mods by different developers will not function with points or credits by other developers. To further complicate things, if you have any third party of custom mods made for your site, some developers will not incorporate another developers credits or points into what they are building for you.

This took a long time to sort out. I believe that if you get a credits system that uses the alert engine system then is should be able to be incorporated with any other mod that uses credits. I could be wrong, but this is the way i understand it.

Hopethis helps,

Nathan