I have a Trek Rail 9.9AXS and a Levo Expert. I've ridden each bike more than 150 miles (160 on the Rail and 900 on the Levo) and would be happy to answer questions. Last night I rode both bikes back to back over some of the same trails and I can say they are both GREAT eMTBs and probably among the best bikes in the market. I can also say there is no clear winner.
The motors and geo do feel different. The Brose and Gen 4 Bosch are both excellent motors and probably the two best motors you can get today. I've had no reliability issues with my Brose, though I know several people who have. The Bosch G4 is too new to have good data on reliability. I can't detect any outright power difference even though the Bosch has 75Nm and the Brose MagS 90Nm. The Brose is quieter and smoother sounding under load and the Brose is MUCH quieter when descending. The Bosch has a great deal of clatter associated with the freewheel mechanism inside the motor. Both are quiet enough on smooth ground and climbing, but if you don't like noise on a bike in rough descents, the Trek (Bosch G4) will not be for you.
Neither bike is perfect. Both bikes are very good though. I'm considering doing a detailed review if there's enough interest in it. Ultimately, if you are considering these bikes and have the cash, you will be very happy with either. I personally feel the best value in the Levo line is the Levo Comp Aluminum (now that it has the 700 battery) and the Rail 9.8XT. The 9.9AXS I have is nice, but the 9.8XT is a far better value and the new XT drive train works amazingly well. I would not have bought the AXS bike if I hadn't received a great deal on it. There's a LOT more detail I could provide if interested.