MegaSquirt (MS3) or Holley HP EFI

Looking for opinions. Doing a Turbo magnum swap into a Scamp. Want to stay EFI and have the tunability. Will be mainly street driven but want the ability to turn up the boost and go play on or off track. Anyone with experience with either system? From what i understand, the Holley is SIGNIFICANTLY more expensive. I guess the question is, Is it really worth the extra money when budget is a concern?
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