What opk strips do everyone use?

I've been ttc #1 since February of this year. Was on the pill for about the last 6 years consistently. Haven't been tracking bbt or done any ovulation testing but feel like maybe I should try the strips to see if I'm even ovulating. Was gonna order some off of amazon but there are so many options! Any input would be very helpful, also any tips since I've never used them before. Thanks ☺