Does anyone find certain generics of Cialis to function better than other brands

[JayneFonda]

For me the Teva Tadalafil does not function as well as Apotex Tadalafil

Theoretically the generics should be bioequivalent but for me after lots of trial and error this is clearly not the case

Is there anyway to know which version will be the most potent outside of trying them all?

In addition does the brand name one function better?  

[Hawk]

I never compared both but are you positive you did not get a counterfeit for an online pharmacy?