Remote ECU tuning vs dyno tuning - which is better for BMW?

Ive done both remote tuning and dyno tuning on different BMWs and wanted to share my comparison.

Remote tuning:

• You read the ECU file at home with an OBD tool
• Send the file to the tuner via email
• They modify it and send it back
• You flash the modified file
• Cost: 300-500 EUR typically
• Pros: convenient, no need to visit a workshop, can be done anywhere
• Cons: no real-time adjustment, tuner cant hear/feel the car

Dyno tuning:

• You bring the car to a workshop with a dynamometer
• The tuner makes changes and tests in real-time
• Multiple pulls to optimize every parameter
• Cost: 500-800 EUR typically
• Pros: real-time optimization, tuner can verify results immediately
• Cons: need to travel to the workshop, takes half a day

My experience: for stage 1 on modern BMW engines (B47, B48, B58), remote tuning is perfectly fine. These engines are well-understood and a good remote tuner knows exactly what parameters to change. The results are within 5% of a dyno tune.

For stage 2+ with hardware modifications, dyno tuning is better because the tuner needs to account for your specific hardware combination.

What has been your experience?