Re: stranded vs. solid wire
I live in MA and am quite familiar with AFC cable.
This may surprise you but until I saw some on this forum I had never seen stranded AC or MC cable in 20 years in the trade.
If I was given the choice I would stick with solid, I am used to it and I do not see much more labor with it. IMO it terminates better and easer.
Putting wire in a raceway my choice is stranded, but I do not get to choose to often.
Most of our job specs require solid for 10 awg and smaller.
Most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design and unnecessary complexity should be avoided.