FiiO - FH19 vs ThieAudio - Monarch MKIII

These two are evenly matched on the broad strokes, with the decision sitting on which individual spec advantages weigh more for your use.

Pick the FH19 if you care most about impedance. The biggest gaps in its favor are impedance.

The Monarch MKIII similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.

Both ship with comparable driver count, sensitivity, detachable cable, so those specs don't separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.