Hi William, welcome to IIS.
I agree with the prev poster, it comes down to portability. If you're only using it at home and can wheel it outside if you get it on caster wheels or something, get the solid tube. If you'll be taking it around, get the collapsible. I don't care how strong you think you are, you'll tire of carting a solid 12" tube around if you'll be travelling a lot and you'll either a/ replace it shortly down the track or b/ give up on the hobby entirely because the effort of the experience has put you off. The best scope is the one you will use the most.
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