What everyone else said really - they're not competing, or mutually exclusive, skills, and having both in your armoury is far better than only having either one.

It's not ear V written, it's ear + written.

Which you prioritise in the short term depends on your situation, and which skill will benefit you better in the immediate future. But you'll be a far better, more flexible, broader-based musician if you can do both to a passable extent.

And then you'll also be able to disprove the old joke: what's the best way to shut a melodeon player up? Put sheet music in front of them.