Typically solid is

Typically solid is “recommended” for ceiling and in wall while stranded UTP is used for patch cables.  For short runs, less than 100 meters it honestly doesn’t matter much in terms of performance; however, stranded is used more frequently when retrofitting since it is easier to work with.

I used Cat 6A STP (Shielded Twisted Pair), Solid Conductor for my home but I doubt I would have noticed any difference going w/ some of less quality.  My recommendation is to use high quality connectors and connects.  I’ve seen a lot of people use Cat 6 cable then use Cat 5e connector andor patch panels and run into issues later.