Apps and Ovulation Days

Kanay
Hey again ladies! Please Help! 😩 I have a mouthful for you this evening! Here goes nothing! 
During my TWW so many things are running through my mind! I love Glow but I also used Pink Pad. Initially I just used Pink Pad to track my periods! It is always spot on in comparison to Glow but I love Glow for other reasons! It's become a lot more popular with more to offer. I would like to throw it out there that this is my first cycle and I actually didn't use my OPKs until after we tried. I bought them after doing some research. 
So here's my dilemma. Pink Pad says Wednesday May 31st was the day I ovulated. Always has my period day spot on. Glow does not. I usually have to edit. But Glow says I ovulated 2 days later. I took an OPK June 1st and 2nd and they were positive but I could have just had a long surge that lastest a couple days.  🤷🏽‍♀️
Which do you think is more reliable? What apps do you use? Are some spot on and others not? I know timing is everything so marking my DPOs and for testing purposes I'm really not as sure as I thought on what day I ovulated.