VVDI MB Tool VS. AVDI VS. Diagspeed Mercedes Key Programmer

VVDI MB TOOL is the most hot-selling mercedes key programmer in 2019 year. Why people like xhorse vvdi mb tool? is there any advantage that vvdi mb tool has, while other mercedes key progarmmer don't? like AVDI, Diagspeed... VVDI MB tool, Diagspeed and AVDI can do 204 lost key but which one is better / more [...]