Thanks to everyone who provided detailed reasons.
And a reply...
I don't get it. From what I'm reading the rules for PF Grab and 3.5 Improved Grab are functionally identical (and it seems the PF Glabrezu doesn't have grab, which makes the comparison sort of pointless). The rules aren't the things heaving and puffing here. To top it off that I don't see any simplification in the PF grappling rules, just different target numbers and different ways to figure them out. The PF explanation is much cleaner, though.
The rules of PF adhere to combat maneuver system. With an exception of special modifier of +5 to maintain grapple, and that maintaining the grapple is a standard action (thus making things like multiple attacks impossible or difficult), and apart from different rules for multiple grapplers, and... you know, the differences just keep piling.
I have found PF version to be more intuitive and easier to explain. It is also safer for player characters (death by grappling is not as quick as previously).
Rest assured, PF Glabrezu still is capable of grabbing, it's a design choice to replace Improved Grab with another attack which is faster to run, does not preclude Glabrezu from engaging its multiple attacks (as I said, use of multiple attacks with a grapple is much more difficult to pull off under PFRPG) and is thematically appropriate.
I didn't know there was going to be a test... and who is "us"?
I liked Pathfinder's initial goals to maintain compatibility and deal with problem rules. It looks like they threw that goal out the window somewhere in the beta process though. I have hundreds of dollars worth of books and PDFs as a reason to stick with 3.5. To get current with Pathfinder it would cost hundreds more, and I'd have to relearn tons of little differences in order to play the exact same game.
Making a public post is always something of a test, don't you think?
Yes, there are things to be relearned, but it's a matter of doing some research. It's not a big of a problem, especially since information is well organized (additionally, the book comes with an index, PDF with links and bookmarks and the sites include search options).
Regards,
Ruemere