Are there even any? I only know of Bosch, but it's basically just a rebranded Ecovacs.

Ideally it has home assistant integration

Edit: After a quick research I came up with this:

• Vorwerk: Way too expensive. Premium price for a very basic device
• Kärcher seems like a solid choice
• Dyson is expensive and the performance does not quite seem to match the price
• Philips, Electrolux and Miele also offer vacuum robots, but I don't know how good they are, yet
• There's also Samsung, which is not european, of course, but at least not chinese or american