I'm pretty sure most of here prefer a well-known headphone brand like the Sennheiser so you'll mostly get recommendations for Momentum here. That, and Focal Spirit ones had a bit of a rough start with that ~10% of faulty drivers with the first batch. Mine worked just fine though, and have been doing so ever since the purchase.
I can't stress enough that you should TRY ALL OF THEM YOURSELF also though! It's you who'll be listening to the music after all. You should simply pick the ones that sound the best for your ears.
I've had the Spirit Ones for 6ish months now, and I can say this about them in comparison:
- I LOVE the bass. I'd pick these over the Senns if you're going for bassier music and/or movies with the headphones.
- 100 € cheaper compared to the Momentum where I live. That was the main thing why I chose them.
- If purely looking at the looks I'd pick the Momentum over the Spirit One.
- Spirit One sounds a little bit veiled compared to some more expensive headphones that aren't designed for mobile usage. Might be due to the somewhat recessed highs. I can't say this for sure about the Momentums in comparison, but according to headroom it seems to have a similar frequency response at higher freqs.