Compression fittings have to match the tubing measurement. So in your case you would need 7/16 ID x 5/8 OD compression fittings.
As for brand, I've only used Bitspower compression fittings, but have used EK and XSPC adapters and haven't had any problems with any of them. I did have one Bitspower 90 degree rotary compression fittings leak, but that was one out of about 50 that I've ever used
Edit. site was acting funky and multiposted on me. Apologies