All the oil on sale today has to meet the current API spec, which is pretty stringent - and about to get much more so. IMO you almost cannot buy a bad oil. All are good, there may be a few that are marginally better in some way due to an additive package. Even the private labels are made mostly by Pennzoil/Quaker State or Valvoline. Go with a brand you are comfortable with.
My choices for oil tend to be:
Castrol, because I like the rep and they occasionally contribute oil for my race cars. Valvoline, because they sponsor the SCCA Runoffs. Also, because they are a no-nonsense manufacturer of high-quality lubricants. Parts Plus Oil, because it's inexpensive and it's made by Pennzoil/Quaker State or Valvoline, depending on where you order it. I figure it's the same oil as the branded products. It's also the same oil you get at the Kwik Lubes.
Redl