I thought frer was more sensitive?

Lovely • IG: Plentifully.day TTC #4. Sept 2014 tubal reversal. Feb 2016 HSG: blocked tubes. May 2016 IVF: failed. Aug 2016 BFP turned to 4th loss
Does the cheap brand really pick up hcg more? Not fmu, 4-5 hour hold, both with same urine