What's the deal with Digital?

Katie • We love our sweet 3 yr old girl and are looking forward to a rainbow baby arrival in April!
So I've read a few times on here that digital tests are not good to use when testing early because they require more HGC to be detected. My question is then why do they say they can give results sooner than the dye tests? Like mine says 5 days before missed period. Should I use it to test early? I'll be 12 dpo but still 2 days before AF is due. Just don't want to waste it...