For hunting: the Crest

Generally: the N-1

The N-1 star fighter is great but the razor crest is awesome

The Razor Crest was both a home and vital to his job as a bounty hunter.

The N1 is more of the family sports car and meant for doing quests at their destination.

Atm... the Crest makes more sense as he's still synonymous with being a Bounty Hunter. However if they transition the story well to Din more trying to rebuild Mandalorian, the N1 could be amazing for that.

I personally like the Razor Crest

A small fighter with no living space and little storage space just didn’t seem right to me for a bounty hunter. The Crest was a better choice.

Obviously the Crest, it is what Din needs/needed for his job as a bounty hunter, and probably the better option for whatever other career he follows.

However, he could wind up getting something like the Ghost from Rebels, a ship with room for a small star fighter to attach.

That's a really hard decision