Most AMR suppliers will tell you to standardise on one brand. It keeps their quote simple and their margin intact. But your floor rarely runs one kind of job. Pallets and totes, indoor aisles and an outdoor yard, light picks and heavy tows: each asks for a different robot.
A mixed-brand fleet, also called a multi-vendor fleet, lets you put the right robot on each task instead of forcing one supplier catalogue onto every move. Done well, it lowers cost, removes single-supplier risk, and covers work no single brand handles. Done without coordination, it deadlocks in the aisle. This piece covers both: where a mixed fleet pays off, what makes it work, and when one brand is the better call.
No single brand is best at everything
Every AMR vendor optimises for something. One is strong on heavy pallet moves, another on fast tote transport through busy aisles, another on tight navigation, another on price, and another on local support and spare parts. None leads on all of it. When you standardise on one brand, you inherit its weak points on every task it was not built for. Picking per task means each move runs on a robot that actually fits it.
Each brand has specific models for specific jobs
Brands do not only differ from each other. Each one has a line of models for different payloads and form factors: tuggers, under-cart lifters, pallet movers, conveyor-top units. A 100 kg tote carrier and a 1,000 kg pallet mover are different machines, often from different makers. Matching the model to the job beats stretching one platform across work it was never sized for.
Few brands cover outdoor and indoor-outdoor work
If any of your transport crosses a yard, a dock, or runs between buildings, this point alone can decide it. Most AMRs are built for clean, flat, indoor floors. Only a handful of vendors offer outdoor or indoor-outdoor robots that handle weather, ramps, and uneven ground, and an indoor fleet leader is rarely the right outdoor robot. The moment you have outdoor moves, a single-brand fleet usually stops being an option.
No vendor lock-in
A single-brand fleet hands one supplier your pricing, your roadmap, and your risk. Their next price rise, their lead times, their model end-of-life, and their support quality all become yours to absorb, with little room to push back. A multi-vendor fleet keeps you free to add the best robot for the next job, to negotiate, and to avoid being stranded if one vendor stumbles. You own the operation, not a single catalogue.
Protect what you run, add for the next job
Mixed-brand is not only for new floors. It is how you grow one. Keep the robots that work, add the right machine for the next task, and expand by adding rather than ripping out and replacing. Your earlier investment keeps earning while the fleet grows around it.
What makes a mixed fleet work: orchestration
The catch with mixed fleets is coordination. Robots from different suppliers default to working in their own silos and can deadlock where their paths cross. Two layers fix that. A vendor-independent fleet manager coordinates traffic across brands, increasingly through the VDA 5050 standard, which lets compliant robots from different makers run under one fleet manager. Above that, an orchestration layer takes transport orders from your WMS or ERP, prioritises them, and dispatches each to the right fleet.
Get those two layers right and a mixed fleet runs as one operation. Skip them and it runs as several fleets fighting for the same aisle. This is the work, and it is exactly where a vendor-independent integrator earns its place.
The standard keeps maturing: its current version is VDA 5050 3.0 (March 2026), which widens the set of brands you can safely combine. ABB is among them, one of the AMR makers we partner with and deploy.
When a single brand is the better call
Mixed-brand is not always worth it. If your floor is small, uniform, and runs one kind of move indoors, one brand keeps things simple and the coordination overhead is not worth paying. We will tell you when that is the case. A fleet you can run easily beats a clever one you cannot.
How Flow+ approaches it
We are a vendor-independent AMR integrator. We pick the robot per task across brands, not the one we happen to sell, and we run mixed fleets as one operation: a vendor-independent fleet manager for the robot traffic, and Flow+ Ctrl to take transport orders from your WMS or ERP and dispatch missions across the fleet. If a single brand is the better fit, we say so. The same thinking runs through our approach to AMR integration.