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Considering my situation I went for collapsable for portability but thinking back I could have gone for a solid tube I think. Alway hard to decide for a 12", but for an 8 or 10" the choice would have been a bit easier for a solid tube (for me at least) as my cars can easily fit a solid 8 or 10".
The other main reason is apeture which was the final decision to go for collapsible 12". I must admit I dont have a problem with colimation of secondary but am starting to experience shifting of primary collimation a lot now. Although colimation is now quite easy.
If you can go for a solid tube (fitting in your car then go for it).
I am also curious now whether apeture in relation to vision is a linear path. I know for my experince in hearing/electrical it is a logarithmic path so 2 x power or 3db does not provide a 2 x actual listening volume. I am wondering if vision has the same pattern.
For CCD the vision is near linear but not sure for the eyes. (This is more a biology query)
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