Really don't know what's best. The full of features script or the superior support? Even if I've already bought another similar script I search again as I've been disappointed from the other one. Even simple (in my opinion) features (eg lookups) were missing.
Powerfull PHP DataGrid is really powerfull. And if you don't know how to do something, its author is always there (even on weekend) to help you.
I really love to use it.