Those Comp Cams both have more lift than the OEM. The XE250H is more intended for trucks and/or fuel economy. The XE268H is a mild performance cam kind of a step over an "RV" cam. Both respectable for their intended purpose.
Yes but I bet AJ VP index calculations on these cams would come out as losses to VP.
Which he states will give loss to low rpm tq which that video shows opposite.