Opk best brand?

Meagen

I used clear blue for 2 months and it was pretty accurate with ovia but not glow. So this month i tried first response and im getting negatives when ovia says im in my window.

Which test do ppl use more/find more accurate.

I dont and cant temp as i work swing shift and wake at different times all the time.

Also ive heard not to use fmu for opks right?