Grodd has been punted across the united states and still kept on going. he has a pretty good healing factor and is fast enough to stop the Flash in his tracks. He would take a majority, IMO.
http://i3.photobucket.com/albums/y92/silicondream/Flash/flashv247kebbin16.jpg
i some how doubt luke put in grodds position would be effected by that flash back in the day...facepalm2
grodds excuse was he is a gorilla...
plus also in the same era as that pic gorilla grodd was squeezing flash with all his might to crush him...
so i guess flash has super durability as well with resisting being crushed by a gorilla
Grodd's taken some very hard punches.
http://i3.photobucket.com/albums/y92/silicondream/Flash/tenchi_fl211_p05.jpg
http://i3.photobucket.com/albums/y92/silicondream/Flash/tenchi_fl211_p06.jpg
http://i3.photobucket.com/albums/y92/silicondream/Flash/tenchi_fl211_p10-11.jpg
BTW, Fallout's blasts were strong enough to disintegrate solid metals. Yet, Grodd was able to take the punishment. Don't hate.
and all this doesnt take away that in the same era grodd is barely above a fellow gorilla.. although monsieur Mallah was killed by grodd he showed that gorilla isnt that far above his natural gorilla strength nor durability he was able to rock grodd and give it his best shot..
at best grodd is partially above mallah and natural strength of a gorilla..