FWIW & IMHO:
From all of the threads that I have seen on this very subject, if some type of survey/poll could be measured on/by customer satisfaction, I am willing to bet that Baldwin would be 1st, Mobil 1 2nd, K & N 3rd, Amsoil 4th, and AC-Delco 5th, with most other filters coming in behind them somewhere. I run AC-Delco PF 52 and change the filter and Mobil 1 every 3 K miles, religiously.
I am sure that Baldwin and Mobil1 are better than the AC-Delco PF 52, but I think that dollar for dollar the PF 52 is hard to beat.
However, I must admit if I had some of you guy's money, or the money that some of you guys have in your motors, I would be running Baldwin/Mobil 1/K&N. I am on my 5th Turbo Regal, and I have run Mobil 1 oil & AC-Delco PF-52 in all of them, and have never had any problems that I can trace to oil/oil filter. Never lost a turbo either.