I've run a portable set up for three seasons/ Everything they say is true, they are a pain to store, there is no charging in storage or on the road, they could grow legs and it does take a few minutes to set them up and seconds to adjust them.
This year I have been testing what will be my mounted system portable and I have kept them flat like they will be mounted to get use to the output. My, my, my, I just never knew how addictive that early morning sun is. My smallest portable, a 230w panel tracking the early sun can kick my 750w system flat for hours before the sun gets high enough for the flat system to really get going. The same is true for the late afternoon sun while you are trying to replace the power used for dinner.
Having the big system flat cost me about 10a at peak as flat mounted is never really lined up.
So for us, the answer is both a mounted system and a light weight portable.