Both finishes are everywhere right now. Matte black has been the fixture of choice for the better part of a decade. Brushed brass arrived a few years later and has not left. Both are beautiful. Both can look dated if they are chosen without enough consideration. And both can look timeless if they are chosen with the right bathroom around them.
The question is never which finish is more fashionable. It is which finish is right for your specific bathroom, your specific palette, and your specific tolerance for maintenance.
The case for matte black
Matte black is one of the most versatile tapware finishes available. It works in a wide range of palettes from cool whites and greys to warm stone and terracotta tones. It reads as crisp and modern in a minimal bathroom, and as grounded and elemental in a warmer, more textured one.
Its durability is worth noting. A quality matte black finish from a reputable manufacturer holds well over time. The caveat: lower-quality matte black coatings can scratch and chip. This is a finish where the brand matters as much as the colour.
Where matte black struggles is in very warm or very ornate bathrooms. If your tiles are honey-toned travertine and your vanity is timber, matte black can feel like it has arrived from a different room entirely.
The case for brushed brass
Brushed brass is the warmer choice, and in the right context, it is extraordinary. Against stone, marble, cream tile, and warm plaster tones, a quality brushed brass fixture reads as refined and quietly luxurious in a way that few other finishes match.
The concern most people have with brass is that it will feel dated. This is a reasonable concern with polished or lacquered brass, which has a more trend-specific quality. Brushed or unlacquered brass is a different proposition. It has centuries of use in European bathrooms behind it, which suggests a staying power that trends do not usually provide.
Brushed brass does require more attention. It shows water marks more readily than matte black, particularly in hard water areas. Wiping it down after use is not optional if you want it to maintain its appearance.
What actually determines the right choice
Your palette. Specifically, whether it runs warm or cool. Warm palettes with stone, timber, cream, and sand tones almost always look better with brushed brass or brushed nickel. Cool palettes with white, grey, and concrete tones tend to work better with matte black or chrome.
If your palette sits in the middle, look at the undertones of your primary tile. A tile that reads warm in certain light will almost always benefit from a warmer fixture finish.
Tapware is one of the most visible elements in a bathroom. It is also one of the most expensive to change after installation. Choose for your palette, not for what is popular right now. What looks considered in your specific bathroom will always outlast what is trending.