ept vs first response

I'm confused because I got a faint positive on 2 ept and 1 equate pregnancy test (yes their blue dye and no I don't care I think they are just as reliable, if they were false positives why would all 3 show up positive, also three first signal that we're very faintly positive (I also took an equate a few weeks ago and it was negative and stayed negative)) but I took a first response and me and my husband think we may see something it's to lights to be sure. So my question is why is first response supposibly better but ept is darker? What's your experience? Did you have a blue dye that wasn't positive but said it was? Did you have a blue dye show up before a pink dye? Has anyone had problems with the first response curved handle cause I've heard bad things about those?