Supercharged or Turbo?
:prayer:Turbocharged Engine
Turbocharged Engines like Low Compression.....in the neighborhood of 7.5:1, 8:1, or I would even recommend up to 9:1 CR.
Detonation becomes a issue over 9:1, and then you'd have to run 95+ octane all the time.
What I like about turbo(s) is: you can dial the horsepower/Tq up or down depending on boost level, with a Manual Boost Controller and a External Wastegate.
Choose a .7 bar wastegate and leave the boost there (10 psi) or inch it up to 1 bar (14.7 psi) or pour in some C16 and crank the boost to 1.5 bar, (22 psi) for some real fun.
Each pound of boost is generally worth 10-20hp depending on how the charge air is cooled...Aftercooled, or nonaftercooled..