Boa Constructor vs SPE

I’m trying to use a visual designer for wxpython.
These 2 seem very powerfull but the lack of docs doesn’t “light” me much on the choice.

Can you advise me and say the reasons, please?

I guess I’d go with SPE, since it comes with wxGlade integrated (docs for it are here), as well as XRCed (which comes bundled with wxPython, but in SPE it’s only a couple of clicks away).