The short answer is a resounding yes, you absolutely can and should mix different brands of urban outdoor furniture. The fear of it looking "odd" often holds people back, but a thoughtfully curated mix often yields a far more personal, dynamic, and stylish space than a single matching set. The key lies in intentionality, not randomness.
To achieve harmony amidst variety, focus on unifying elements. A consistent color palette is the most powerful tool. Choose two or three main colors and ensure all pieces, from sofas to side tables, adhere to this scheme, even if their materials or styles differ. Next, consider material and texture. Repeating a primary material—like weathered teak, black powder-coated aluminum, or concrete—creates a visual thread that ties disparate brands together. You can then introduce contrast with secondary materials, such as woven rattan cushions on a metal frame or a glass tabletop on a stone base.
Balance is crucial. Pair a large, solid sectional from one brand with lighter, more delicate chairs from another. Mix geometric, modern lines with one or two organic, curvy pieces to add interest. Finally, unify the entire scene with cohesive accessories: outdoor rugs, throw pillows in your chosen palette, consistent planters, and ambient lighting. This layered approach draws the eye across the space, making the mix look deliberate and curated rather than accidental. Ultimately, your outdoor area should reflect your taste, and a skillful blend of brands allows for greater creativity and a unique oasis that avoids the generic showroom look.