Any point doing a first response?

[Dragonfly Fi]

Is there any point doing a first response if you haven't had a line on a one step? I am confused because I though one step were more sensitive but am getting different information for everywhere...

 

[PINK BUTTERFLY]

Yeah im a little confused about this also as ONE STEP are 10ml and First response are 12ml (i think iv got that right) so that means the One step ones are better but you only get a faint line on them but a better line on the First Response....confusing! LOL x