If you are going to make keys from dump and readingwith a programmer buy tango.
Tango good support and more features.
Most makes/models have guides with pics
Many makers are free with standard tool and you can just add when you need
Xhorse VVDI2 Pros:
If you are looking to make keys over OBD buy VVDI2 is a good tool for BMW CAS/MB EZS.
If you buy VVDI2 I also recommend complement with VVDI programmer.
So, what about buy both original Tango and Xhorse VVDI2?
Of course you can, but there are a lot of cars that you will need to remove BCM's, immo's...etc because vvdi2 and tango makes keys from dunmp except vvdi2 makes bmw and vag over obd2. skp900 and obdstar make keys via obd2 and don't work on fiat, opel, renault and some few brands.
Part 2: VVDI 2 VS VVDI PRO
VVDI Pro is used for Chip bottom communication, read erase write eeprom flash data. VVDI2 is for OBD key programming, KM reset and repair and more functions. Better refer to the user manual.
Newest VVDI PRO V4.6.5 free download (with user manual)