While I love a well-integrated piston filling system like the Lamy 2000’s, I cannot dispute the practicality and reliability of the tried and true cartridge converter system. As I primarily buy Japanese fountain pens, cartridge filling systems are largely the only game in town. A couple exceptions would include my Pilot Custom Heritage 92, and a Sailor Realo, but Japanese piston fillers are few and far in between.

I have several Parker 61's which are capillary fillers. If you never change the ink, the capillary fill is super easy and clean. They are a bear to clean if you must change inks. The Parker 61 was an upgrade from their 51 so the nibs are super writers.

I’m new to fountain pens but I’ve seen a snorkel as well. I’m guessing they don’t have them anymore

A lot of people kinda turn their nose up at cartridge/converter pens but frankly? It's the best system out there, easy to clean, maintenance borderline absent (might have to grease the piston of the converter if you bother but I've never seen anybody do that) and convenience of use while traveling, the only thing better I can think of are Japanese eyedroppers but those are expensive and often unwieldly (the only compact option I know is the Opus 88 mini).