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I said barbs earlier mostly because I believe they make a better seal with the tubing than a smooth tube, of course either would work and tube is obviously simpler.
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If you think about it the smooth tube provides a better seal(more of the two surfaces mateing) than 'ribbed' barbs, barbs are ribbed to prevet airhoses being pushed off of them, or normal hose being pulled off, not to aid seal. As long as a smooth tube is clamped evenly it's seal is better, we're not talking high pressure here are we?...
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One thing I wonder about is when sealing/glueing a copper tube into a poly top is how big to make the hole oversized to allow for adhesive?, too big and you're relying on the adhesisves tensile strenght as well as it's bonding strenght? (did I put that right?)...
I 'spose it all depends on how fluid the adhesive is?...