Ultra Pure vs. QF 4.2

I have a test at Quest next week. I purchased both the 4oz. Ultra Pure and a bottle of QF 4.2.

Which one should I use? Anybody have experience with both?

I like the idea of having 4oz...but if QF is more reliable, I will go with that.

Thanks in advance brothers and sisters!

If youre concerned about reliability, test your bottle of UltraPure with a validity test strip to make sure the creatinine, pH, specific gravity, etc; are in the proper ranges. The same with your QF 4.2 bottle.