Motorcycle Graphics: Airbrush, Decal, Or Good Ol' Paint?

I'm about to start a new motorcycle build (to be detailed later), but something I'm really looking forward to is a gas tank graphic. Without giving too much away, it's going to be an animal. Can anyone help me decide what the best application format would be?

It's an older bike and the look I'm going for is "irreverence," so the retro-goofiness of airbrush look would be pretty perfect, but I'm not sure it's going to be worth the coin (full disclosure, I haven't priced it out yet.) Straight-up painting, which is I think how the graphic above was applied, seems enticing too for higher fidelity to realism.

Would love to get y'alls opinions on the merits of getting my animal airbrushed onto the tank or having some company make a kickass decal of a .JPG.

Image: Motorcycle graphic I saw at a meet once