For quick scanning I an app on my phone. Torque pro. Was $5 and you just use it with a obdII Bluetooth scanner. Paid around $20 or 25 off ebay. Decent little gadget and can run live statistics. They make a free version still (I think) so you can try it out.
Those work fine but not as detailed as vagcom. I have a generic obd2 scanner. It's good to keep in the car for a quick scan. But if you really want to pin point an issue, vagcom. Plus you can charge your friends a case of beer to scan their cars, adjust idles, ect.
Good example of what a generic tool won't tell you. I had my steering wheel light on when I replaced my steering rack. Hooked it up and found this
Steering wheel was 360 out. Wasn't paying attention but I must have turned the wheel 1 full turn before I installed the shaft to the rack.
Also most scanners will not read ABS faults.
I also have the full version of vcds. If you plan on having the car for a while or just plan on owning a VAG vehicle at any other point, I would look into getting a full version of VagCom. Has saved me so much money.