There is no best "brand" as everyone has their favorite as you can see here by the posts.
The current Kendall is not the old "green" Kendall. Kendall was sold years ago and the recipie changed. The old "green" oil is still available and is produced by Brad Penn based out of Pennsylvania. Very good oil.
Joe Gibb's "Driven" oil is shown to make HP compared to others, but is on the pricey side.
Lots of choices out there, I tend to like the Brad Penn stuff myself.
My engine parts suppliers for the 582 (Sunset Racecraft) recommends Joe Gibb's BR Break in oil to break the engine in, then use Penzoil HD30 for 30 passes, then any conventional or Synthetic after that. They find the Joe Gibb's break in oil shortens the ring breakin time on the dyno by several pulls. Again, BR is not cheap, but excellent protection/insurance on an expensive new engine during the critical breakin period.