ive used all 4, and i would say that Batlgrounds is pretty close to Topspeeds and they are both really close to Forged Performances.

Forged has a Dyno Dynamics.

Dynoformance they say is the "heartbreaker" and that can be just from the way they have it setup. We proved with pauls EVO that theirs was a good 30-40hp off from BGs. An it was under similar conditions.

Doesnt really mean much , numbers dont mean anything, consistency is what you want so picka dyno an stick to it.