My favourite Metroid game has got to be Zero Mission on the GBA.
A weird choice maybe but it was my first metroid when I played the GBA, I thought the music and atmosphere was kick ass and enjoyed the simple enough controls.
For a 3D Metroid it would be the trilogy on Wii at the time.
What about you?
My favorite Metroid is a knockoff. Environmental Station Alpha. I can’t help but recommend it in any thread that’s even remotely on topic. It’s not “better” than the official titles but I end up replaying ESA way more. The astmosphere and music just really hit me, and the gameplay is tight with lots of secrets.
My favorite official title is Fusion though. It was so awesome being able to play that on the train to school and lunch breaks.
ESA is a great game