First response or first choice (dollar tree) which is more sensitive? Comment your experiences

I'm asking because some sites say first response is more sensitive than the other and other sites say they are equal sensitivity. I'm a couple days late and still getting negatives on the dollar tree first choice and walmart 88 cent ones. I'm wondering if first response may show now or not. I was pregnant last may and didn't show positive with the 88 cent ones until I was 2 weeks late. Comment with your experiences with these tests please...