With all of the following brands available, is there one that is better than the other? Or are they all equal in their effect?

Broncodil--10mcg tab--Von Boch I
Broncoterol--20mcg tab--Quimedical PT
Cesbron--20mcg tab--Fidelis PT
Clenbuter.Pharmachim--2mcg tab--Biomedica Foscama
Contrasmina--20mcg tab--Falqui I
Contraspasmina--20mcg tab--Arzneimittel Werk Dresden G
Monores--10mcg/2mcg tab--Valeas I
Novegam--20mcg tab--Chinoin Mexico
Prontovent--20mcg tab--Salus I
Spiropent--20mcg tab--Thomae G, Bender A, DeAngeli I, Europharma ES, Promeco Mexico, Boehringer BG, HU, CZ
Spiropent--10mcg tab--Thomae G
Spasmo-Mucosolvan--2mcg tab--Thomae G
Ventolase--20mcg tab--Juste ES