I don't use Red Line products. I used to know the founders, called on them back in the 80s, sold them a lot of esters, and had a great deal of respect for their focus on performance over profit. Hopefully they are still in that mode today but I have lost touch.
I gently drive an Altima in a moderate climate, not a tough lubrication challenge, so I don't need the high performance properties associated with Red Line oils. Furthermore I prefer API certified oils that I know have been tested in standardized engines and passed all parameters. I use Mobil 1 mainly because their Extended Performance grade provides me comfort in annual oil changes, and also because of their use of expensive Groups III+, IV and V base oils, again a focus on performance over lower cost Group III only based synthetic oils. There are other oils that would meet my criteria, but I have no reason to change.