Good morning and merry Christmas. Easy topic to advise the ideal for who as it seems, will be your first scanner? I tell you my experience after not a few years of trying a few models, most of them quite recognized in the environment but that, each one is always missing something according to the vehicle and the solution to be treated, I verified that the specific ones to a brand are ideally, because today the important thing is not only the diagnosis but the possibilities of motorized butterfly adjustments, deletion of service and distribution lights, steering wheel angle calibration, telecoding etc. Having the equipment to buy, since this is the final and unavoidable part of the current repairs, you change everything new and if you don't restart, code or programs, it is as if you had not done anything. Of those you chose, I don't know Diagno 3, but if Autel, due to the experience of a friend about what has its own but that is somewhat unstable in some systems and its limited updates, it will not be convenient above all because the cost is similar to Autocom CDP and of this I can speak a lot and very well, bought in 2009 and that does not cease to amaze me by its capacity to date, with several updates until 2015. I do not know what economic possibilities you can have, since the best, and according to what comes to you, it will be a Diagbox Lexia and the Vag Com, the Lexia used before the Autocom and it is super, and as for the Vag I just finished week, to buy the new version in Spanish at a very low cost in relation to everything he does and when I say everything, it is everything, especially in Amarok with all the stories that it brings in order to complicate the repairers and that with this small interface we give you against, something important when buying is who sells you, since there is a lot of trick on internet pages that if you are lucky ok, but if something is not going well fix, you already paid; in my case. I have the advantage of a personal friend and colleague, who is an importer and specializes those items with a serious guarantee and delivers it to you by working and tested whether you carry your cpu or by teamviewer. I do not know if you live in Argentina, but it will not be possible I think, I hope my experience in the subject can serve you and if you have any other concerns, at your service.