I think it really depends on the area you live.
I was researching liners when I lived in the Pacific Northwest and had decided on Armacoat, but never had the chance to get it done.
Well, interview, job offer, move, and now I'm back in Minnesota. I started researching all over again.
The local Line-X installer went out of business as the extra hard material did not survive the temperature extremes around here.
The main installer does Perma-Tech. Softens a bit in the summer sun, but it withstands the winter cold.
Another popular liner is similar to Herculiner. Thinner application than Perma-tech, but appears to work well.
My 2 bits
-John