I don't think there is such a thing as a 'best' tool, as each tool has its strengths and weaknesses in the models covered and hardware aspects of the tool.
In my opinion, Autologic is a great piece of kit if you are a one-make specialist, but if you do all makes, you'll find it an enormous investment and still find models that you can't do.
The Snap-on Solus. Modis and Verus diagnostic software is essentially the same, but the high-end products offer a built in oscilloscope and extra features. Consider which features will be useful to you and the work that you do (in my opinion an oscilloscope of some sort is vital these days and the Snap-on one is more user-friendly than most).
Launch offers a lot of coverage for the money, although as with anything there will be models that aren't covered.
See if you can get a week's trial with a few machines, and see how you get on.
I have a Modis Ultra that is my first tool to pick up because I prefer using it and it does most things, but I have an old Launch as backup for the gaps, and I think most garages have more than one tool for that reason. I also have a Pico scope which I get out for technical jobs, but for quick testing I use the scope on the Modis as it saves the faff of a laptop. The laptop has a bigger screen and the Pico a bit more flexibility and four channels so it's better for serious scoping, but the apprentice can check things with the Modis as it sets itself up and shows you what to look for.
that's an awesome response, thank you for your input!!
my pico is very old and 1 of the channels doesn't seem to pick up any more leading me to question its accuracy.
i have many other diag tools in the arsenal, my consideration was to up grade the solus but was undecided on whether to wait and upgrade my scope or kill two birds with one stone and get a unit with built in scope (bosch kts / modis / verus ) its the main multi unit the first at hand so to speak but i run a lot of dealer tools as well, i don't get on with the launch or the autel i have a bosch kts 650 but the licence expired a few years back annoyingly makes it a little redundant..
if you have any more opinions on the snap on 2 channel scope over the pico 4 channel id be interested to hear them..
again many thanks for you reply.