Stranded aluminum seems to be pretty reliable except on overhead services where it's exposed to wind and rain. It weighs less and is easier to bend into the lug so the installation is easier. I wouldn't use it to save a couple hundred dollars but for a couple thousand it is on my favourite list.
Solid aluminum has a well known track record. I already learned that lesson.
I read the specs on an aluminum lug a few years ago and it was tinned so it could be used with copper. Are they all tinned?
