I have both.
The RHA is built like a tank. Very durable. Has little filters that allow you to choose the sound sig,( a bit), that you prefer.
The MEE , in my opinion, has a more detailed, more clinical sound.... and it has, in my opinion again, a better range too. So, while it's a bit less bass heavy, it handles vocals better, with a more crisp and more open sound.
They are both quite good.
Just different flavours of good.
The RHA might be better for gym use. If your ear canals can handle the fit,(this is where making sure that you try all the tips until you find the right fit X isolation), try the different filters to see what makes the music sound best to you.
The MEE is probably best for sitting on the sofa listening, vs the RHA.
Neither is better or worse.