Most folks dont solder well....also solder expands and contracts with
heating and cooling of electrical joints...soldered joints can
eventually loosen...as all electrical joints can...but a wirenut or a
mechanical connection can be retightened easier than resoldering.

Look...if you use wirenuts...twist em up good and tight and use the
wirenut to insulate the connection..tape it well....you will be all
set...

I dont like crimp connectors on solid wires ... Ive used the ones for
grounds....but only apply them after twisting the ground together
well... Dont like them on current carrying conductors as most folks
dont use the proper tool to crimp them down or they dont crimp them
well. I run onto a lot of crimped connections that are on solid wire
and they are almost always loose crimps.