I had the idea in my head (so take with a grain of salt) that parts of the BT stack are underspecified such that different implementations tend to have slightly different interpretations of the standard, so the problem isn't even which vendor you use so much as going all-in on any single vendor so the devices all agree on which reading to use.

Although of course Apple might well be better anyways; one would hope that billions of dollars in R&D plus caring about quality makes a difference.