Wire preference - stranded or solid

[WarehouseCrew]

What are the pros and cons of using stranded versus solid core wire for the electrical components? I'm not an electrical guy, but am trying to help our student's clean up the rats nest of wiring on our practice robot (may make same changes on competition robot when at the Regional).

We have been using stranded wire, but I just read that solid core wire allows you to make 90 degree bends.

Does your recommendation change based upon the wire size (eg. 12 AWG vs 14 AWG or 18 AWG)?

I'm assuming if we have a motor mounted on an arm that moves (wire needs to have some flexibility) that stranded is preferred. Is that a correct assumption?

Any issues with crimping on ends (eg. eyelet for attaching to Jaguars)?

Thanks.