I’ve looked at both and honestly they’re both good, just a bit different.
The Dreame one seems stronger in terms of suction and overall power, so it should do better with fine dust and hair, especially on carpets. It also has a pretty advanced dock and solid app control, so it’s more of a “set it and forget it” type.
The Roborock Qrevo series is usually known for being really consistent with navigation and mapping. It tends to move around rooms more reliably and handles layouts/furniture well, plus the anti-tangle brush helps with hair.
If your place has a mix of tile and carpets and a lot of dust, I’d probably lean Dreame for the stronger cleaning power, but Roborock is the safer pick if you care more about consistent navigation and fewer hiccups.
Both should handle app control and obstacle detection pretty well though.