All 191 amino structured GH is basically the same, the only difference is in concentration. The price per iu is the determining factor. Sero and huma are almost identical in price per iu, so either is a good choice. Saizen is a lower concentration, and thus is less cost efficient.
Less stable forms, such as Chinabase, are considerably cheaper per iu, but must be shipped in a cold pack, and arrive cold, or it will be degraded.
Less stable forms, such as Chinabase, are considerably cheaper per iu, but must be shipped in a cold pack, and arrive cold, or it will be degraded.