I ride Shimano SPD Dura Ace, Ultegra and 105 on all my bikes (8 of them), started racing back in the day on Time Criteriums.
I am just partial to them due to durability and quality. Didn't like the stack height and business of speedplay cleat system although the pedal itself is minimal.
Shimano bearing smoothness is second to none although I have come to find the price between DA and 105 is great, function is not.