CONCLUSION:
A switch from Develo on Fritz in 500 Mbit range is meaningless.
The measurement results were exactly as in Develo, and makes sense ... because it is the identical devices :-) the AVM
presumably buys from Develo.
For the ease of use is nothing more to add. Everything works perfectly with more or fewer losses. I have a 100Mbit line, and get about 52 Mbps in the room of my choice. Quasi 10% of 500 MBit.
And those tales of doubling the throughput with the Fritz instead Develos I can not understand easily.