Comparing two flagship contenders

Choosing between the Redmi K90 Pro Max and the OnePlus 13 comes down to what you prioritise. Both bring top-tier hardware, but they lean in slightly different directions when considering UK usage, support, software and overall value.

On paper, the Redmi K90 Pro Max packs a massive 7,560 mAh battery, a 6.9-inch 120Hz OLED display and the latest Snapdragon 8 Elite Gen 5 chipset. It also features an impressive audio setup with a dedicated woofer and Bose-tuned 2.1-channel speaker system. The camera system is strong too, with triple 50 MP sensors including a periscope telephoto of 5× optical zoom. It ticks nearly every spec box you’d expect from a premium phone.

The OnePlus 13 meanwhile offers a more compact 6.82-inch display, the same top-end Snapdragon 8 Elite platform, and premium build and features such as IP68/69 water resistance. Its camera system, tied with the Hasselblad brand, is designed for studio-style photos and professional-grade results. It also benefits from strong software support and a globally available variant (important for UK buyers).

When it comes to battery life, the Redmi’s 7,560 mAh figure gives it a clear headline advantage. That gives it an edge for users who do heavy gaming or consume lots of media on the move. The OnePlus, while lower on capacity (~6,000mAh in reported specs), may still deliver very good endurance thanks to efficient hardware and software optimisation—but for absolute stamina the Redmi has the edge.

In terms of display and multimedia experience, both are excellent. The Redmi’s larger 6.9-inch panel is great for immersive viewing and gaming, while the OnePlus is easier to handle with its smaller size and potentially better ergonomics. If you prefer a phone that’s big but still manageable with one hand, the OnePlus might feel more refined. The Redmi leans into “screen and sound spectacle”.

Camera systems are a slight differentiator. The Redmi offers top-tier zoom capability via its 5× periscope lens, which is rare even in this price class. The OnePlus touts polished photography via the Hasselblad partnership and likely better consistency in real-world shots—especially for portrait and low-light conditions. If photography is your primary concern, the OnePlus may have subtle advantages.

Software and ecosystem support matter significantly for UK buyers. OnePlus has a stronger track record globally for software updates and wide availability in the UK, meaning easier service and compatibility. Redmi’s model may have variability in global availability, warranty support, and update commitments depending on region. For many UK shoppers this difference could sway the decision.

Price and value also weigh heavily. The Redmi enters with very aggressive specs relative to the anticipated cost, giving excellent value for money if its support and availability match expectations. The OnePlus may command a higher premium but arguably offers a more balanced package for the UK market with stronger network and service backing.

Ultimately it comes down to your usage and priorities. If you value raw hardware, battery life, large screen and multimedia features, the Redmi K90 Pro Max presents a compelling choice. If you prefer a more refined, compact form factor, globally-supported service and excellent photography with software polish, the OnePlus 13 may be the smarter pick for the UK.

For UK buyers on the fence: I’d suggest checking local network compatibility, service centre availability and firmware support for both models. If those align, go with the one whose strengths match your daily usage—battery and screen vs camera and service.

In summary: The “killer-spec” machine is the Redmi K90 Pro Max. The “complete flagship for the UK market” is the OnePlus 13. Pick based on what you’ll use most.