its up to you. its personal choice the human eye of a baby can only dilate to 7mm adult eye can only manage 5-6mm. all scopes offer a max of 7mm. the objective lenses divided by magnification. will give you mm of light able to reach the eye. tube wont change that. the quality of lenses will. or size of the lenses.
from what i can work out the only difference is that a 30mm tube will offer you more internal adjustment - ideal if you are shooting long distance and dial in. But no great benefits in light gathering.
I have tw s&b 8x56 scopes one 30mil tube on my 243 which i use for wood land stalking
& the other 1inch tube on my 308 for the hill.
The difference very little in my opinion.
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