Basically if you use 6/6a, you need 6/6a compatible hardware, if you use 5e, you need 5e compatible hardware (i'm talking patch panels and keystones, not NIC's and switches). CCA is crap, but anecdotal evidence suggests it's less tasty to animals (don't ask). Use stranded copper for patch leads, solid for structured. We had years of people falling for 'bigger number = better' logic and going 6/6a for 10Gb in the 'future' and ignoring people who were already doing it, now enough people have run 10Gb on 5e that it's accepted by most that 6/6a isn't required for most domestic distances, in fact 5e/6 are spec'd at similar lengths for 10Gb and its generally a safe bet the spec can be exceeded, you need to go 6a to get a significant increase and it's less fun to work with.
I like to think of myself as being reasonably logical in my approach to networking, if 6/6a would give me anything useful, i'd have installed it irrespective of cost/agro, yet when I moved house at the start of lockdown 3 (and had boxes of 5/6/6a on the shelf) and could effectively spend what I liked on keystones, back boxes, faceplates, conduit, cabinets and patch panels, I still chose to pull 5e and have zero regrets. By the time it's an issue, I - or my kids - will likely be pulling fibre anyway.
