Hey Ozz, I'm assuming that you're talking about the OE, as you mentioned versatility.
As I understand it, a god blast just blows things to hell, and really nothing else, but if anyone would like to show me that it could do other things, I'm interested. Anyway, I'll list some of the things that the OE can do.
1. If by destructive you mean which can do the most damage? Then probably the Omega beams, as they can potentially erase anything from existence if the user wills it (barring beings with extreme cosmic significance). It should also be noted that Superman infused with the energy of Kismet (basically DC's Eternity) and Darkseid's OE were the only things that seemed to be able to breach Imperiex Prime's shell and "defeat" him for lack of a better term.
2. Like I said before, I don't really know that the godblast has so much versatility, as it does raw destructive energy. The OE can erase, resurrect, teleport, time-manipulate, transmute, depower, and maybe some other stuff that I'm missing.
Anyway, if I'm wrong about the godblast, which I may very well be, as I am not a thor expert, and it can do other more "versatile" things, then I am willing to be convinced by anyone who is more knowledgeable about the subject than I.
It's not just the Galactus thing. Four Godblasts held up the multiverse, his Godblast has overcome Cytorrak's enchantment, and blew apart Exitar's skull which was made of even harder material than his outer shell.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
Thor's feats speak for themselves. Let's compare. The omega beams were tanked by Doomsday and the omega effect was redirected by Superman's heat vision.