I’m often reading about Xprog, R260 and R270. Whats the deal about these tools?

I tried so search and read about these tools but this confused me. Can someone explain me short and effective the difference and pros/cons about these tools? Maybe this could be a good sticky for new users.

My goal: correct mileage in BMW from 2000 until at least 2010.

Here is all i found in the CT community. Big thanks to all contributors!! I benefit a lot from this.

Xprog is a universal programmer for various chips in automotive and many more…

R270/260 is based most on BMW and MB immo systems+dashboards+some airbags..it have function for erase 35080/35160 chips too…

both are very good programers and you need them both in this busines..

1 tool is not enough
R270 have the advantage to clear m35080 eeprom
R260 is more safe in MCU
Xprog is a good tool for many chips and mcu
all are Chinese
if you can pay more, i suggest you to buy VVDI Prog

Among ecu programmers, vvdi prog should be the best choice because

faster to clear 35080, 080D0, 160D0 (within 10S)
more stable than Xprog-m to read MC9S12 series chips
faster to attack MC9S12series chips
less error than others to read some EEPROM that Orange 5 fail to recognize
with voltage attack function for use
with CAN bus, K-Line for use
Also, most tools from china are clone while this VVDI Prog is made in the Xhorse company where produces vvdi tools. So, the quality definitely is no issues i think. See the PCB in mine.

This artilce support by:http://blog.obdexpress.co.uk/2017/02/21/ajusting-bmw-mileage-odometer-xprog-or-r270-260/