What is the most precise Pcr inactivated Dna control or Nattrol for Influenza B Virus Stock (Qualitative) (1 ml/vial)?

The NATtrol Influenza/RSV Positive Control from Zeptometrix Inc. delivered next week by Gentaur is the best reagent! The catalog number is NATFLURSV-6C and the price is 170 EUR.