Display

Winner: Xiaomi Mi Air Purifier 4 Compact

This category only really applies to the Xiaomi, because it includes an OLED touch display and smart-home integration. That gives you live feedback on air quality and operating status, which is genuinely useful in a bedroom, nursery, or living room where UK pollen spikes or cooking odours change through the day. The Winix product is not a purifier body at all; it is a replacement filter, so it has no display or interface of its own. If you want visibility and control, Xiaomi wins by default.

Performance

Winner: Xiaomi Mi Air Purifier 4 Compact, but with an important caveat

The Xiaomi is a complete purifier with a True HEPA H13 3-stage filter system that claims to remove 99.97% of particles as small as 0.3 microns. That makes it suitable for common UK indoor issues like pollen, dust, smoke, and fine particulate pollution from traffic. It also has smart controls and a whisper-quiet mode, which makes it easier to run continuously in a bedroom. The Winix Zero Filter A is only the replacement filter element for a compatible ZEROP300 unit, so its performance depends entirely on the purifier it is installed in. If you already own the matching Winix machine, this filter is the right consumable and should restore performance; if you do not, it cannot clean air on its own.

Build quality and design

Winner: Xiaomi Mi Air Purifier 4 Compact

As a finished product, Xiaomi offers the more complete and polished package. You get a compact purifier with an OLED touch display and a design intended for everyday use in small UK rooms, flats, and bedrooms. The brand also positions it as whisper quiet, which matters if you want to run it overnight during pollen season or when windows are closed because of damp weather. The Winix item is a filter cartridge, so build quality is about the replacement part itself rather than the overall user experience. It may be well made, but as a part, it cannot compete with the Xiaomi’s all-in-one design and usability.

Battery life

Winner: Not applicable, but Xiaomi is the practical winner

Neither product is battery-powered, so true battery life does not apply. The Xiaomi’s low claimed energy use of 0.9KW/day is the relevant figure here, because air purifiers are often left on for long periods in UK homes. That makes it easier to run continuously without worrying too much about electricity costs. The Winix filter has no power consumption of its own, but again, it only makes sense if you already have the compatible purifier.

Price and value for money

Winner: Winix Zero Filter A

At £43.76, the Winix filter is £71.24 cheaper than the Xiaomi. On pure price, it is the clear winner, but only if you already own the compatible Winix ZEROP300 cleaner. In that case, it is a sensible, lower-cost replacement that keeps your existing purifier working properly without buying a whole new machine. If you do not already own that purifier, though, the low price is misleading because it is not a standalone solution. The Xiaomi costs £115, but it includes the full purifier, smart features, and HEPA filtration, so it is the better value for a first-time buyer who needs a complete air-cleaning setup.

Game library/features

Winner: Xiaomi Mi Air Purifier 4 Compact

There is no game library here, but in practical terms this category maps to features and ecosystem support. Xiaomi wins because it offers smart home integration, OLED touch controls, whisper-quiet operation, and a 3-stage filter system in one device. That makes it more flexible for daily use, especially if you like scheduling, remote control, or checking air quality at a glance. The Winix filter has no features beyond being a replacement consumable.

Overall user experience

Winner: Xiaomi Mi Air Purifier 4 Compact

For most shoppers, the Xiaomi is the better experience because it solves the entire problem in one box. You can place it in a bedroom, home office, or small living room and start using it straight away, which is ideal for UK homes dealing with spring pollen, winter condensation, or mould-prone rooms. The Winix filter is only the right choice if you already own the matching Winix purifier and need to replace the filter at a lower cost. Its very high review score of 4.7/5 from 8,313 reviews suggests strong satisfaction, but that does not change the fact that it is not a full purifier. The Xiaomi’s 4.4/5 rating from 4,583 reviews is slightly lower, but it is the more complete and versatile product.

Overall summary: if you need a complete air purifier, buy the Xiaomi Mi Air Purifier 4 Compact. If you already own the compatible Winix ZEROP300 and just need a replacement filter, buy the Winix Zero Filter A. For everyone else, Xiaomi is the definitive choice because it is the actual device that cleans your air.