Wondfos, but my RE had me use the clear blue easy digital (not advance, so just smiley or not smiley, no blinking) when I took meds only without IUI. They're super easy to use, but more expensive. The directions want you to take them from CD10, but I just did Wondfos until it was getting darker, then used the digis since that's what they requested.
Love of my life baby boy born 11/11. One and done not by choice; 3 years of TTC yielded 4 MMC and 2 CPs, through 4 IUIs and 2 IVFs. Focusing on making the world a better place instead...and running.
I'm using the CBE advanced this month for the first time. They're very easy to use and read but I didn't understand the blinking smiley vs. regular smiley until a few days ago when I posted about it here. Empty circle is low fertility, blinking smiley is high fertility, and regular smiley is peak fertility. I'm on CD17 and Day 6 of blinking smiley and waiting on the regular smiley and I can see why some people get anxious from several days of blinking smiley!
I used Clear Blue. They were on sale one day so I went for it and I really like them. I just get the smiley or no smiley. I got the CVS ones once but I hated those. Clear Blue is just so easy to use that I'm willing to pay a little extra for them.
I tried the CBE advanced. If they actually worked, they would be good, but mine kept erroring out and they get expensive. So now just wondfos, because I can use a ton and not feel like it's a waste of money.