15400 vs 15510

[Son Goku]

Hi everyone. I’m currently debating between a steel 15400 and a 15510 for my first Royal Oak. I’m not a huge fan of the 15500 so would consider that one ruled out.

I know the 15510 has the upgraded movement and other tweaks, but I’m curious hearing from others who have either owned or handled both what your honest thoughts are.

They both seem like amazing watches to me, but would love to hear some perspectives including which one you prefer and why! Thanks in advance