Just saw this post.Go with Crucial.
Avoid OWC. I've had major problems with their RAM, going back to the 2008 Mac Pro. Multiple bad sticks over the years across desktops and laptops. The most recent failure was late last year, blown OWC sticks in a 2017 iMac. I didn't buy the sticks, a colleague did. Nine months in, bam, blown sticks. Should have known, and man was I pissed, because this was like the fourth or fifth time. It is never happening again, if our company buys their RAM again I'm intercepting the delivery and throwing it out.
Note, as I was getting third-party Applecare service for this latest OWC RAM failure, the repair techs mentioned they too had seen a lot of blown OWC RAM sticks, and for their personal computers, they won't touch it. Also, search these forums, you'll see longtime and heavy Mac users complain about it. Not my intent to bash OWC, but my personal experience and many anecdotes say to stay away from their RAM.
(Not affiliated with Crucial in any way.)