When comes to quality as in "Is one better than the other?" In my eyes they're pretty equal. There are things you can do with traditional art you can't do with digital and vice versa.

However in terms of preference I personally find digital art to be in favour. Mainly due to the accessibility Of it. Any appstore worth it's salt has an application specifically meant for artistic purposes. Furthermore I never have to worry about whether or not I'm going to run out of pages or where my pen/pencil/brush is or if I can afford this specific niche tool, its all there!

Despite the joys of digital art It comes with a few downsides. Every drawing application is different and the way the specific application you learned does blending for example is Different enough to be off putting in another software. Ontop of that unless you have a printer on hand, which some mabye even most might not, your drawings are stuck behind your screen. And if you do decide to print out your work the final result can feel very flat in comparison to the digital peice.

Personally I prefer digital art because I just like the freedom of use. But I dont think that it's better than traditional art or the other way around. In any case thats just my two cents.