Coil spring is a matter of feeling. A fork with a coil spring is neither better nor worse than an air fork, it’s just different. The small bump compliance of a coil spring fork is unmistakable, its linear behavior is very distinctive. If these are the things you are looking for, the Selva C is your address, a set-and-forget beast.
You can choose between four different spring options: soft, medium, firm, and super firm. The spring preload can be adjusted externally through the knob on the right side of the fork.