I’ve had the Sunline Thicks and am currently using the Lizard Skin North Shores. I seem to remember measuring them and found the North Shores were very marginally bigger. Never tried the Ourys. I will say the Sunlines are softer (as less hard wearing as a result) though.
It’s always annoyed me that there is very little choice in bigger grips and i’m expected to use ‘normal’ grips when i’ve got shovels for hands. Everything else can be size specific but never grips. Can’t see it changing though so i guess i’ll make do…..