We have Diesel Laptops Inc. with their Texa communication box and software. Foll on highway and off highway software packages. Full boat to get started was around 8k. It costs $1500 per year for updates and full product and tech support. Overall I am happy with the customer service and quality of the product. We have only had this system for 1 year and I have been using it since April 2019.
Prior to this job I worked for a Mack Trucks dealer with full dealer level software. I worked for Ryder truck leasing before that and we had Noregon communication boxes and dealer level software for each brand. (i.e. ET for Cat, Insite for Cummins, DDEC for Detroit, etc.) Another company I worked for 10 years ago had the NexIQ with generic heavy truck software and the IH software package. I own a first generation SnapOn Modis and had a Solus pro and an original Brick back in the day. I don't really work on cars anymore so I just keep the Modis for my own stuff and try to use it when I can.
What I have found is that if you have enough equipment to justify the factory/ dealer level software that's what will be the best. If you have a decent knowlege of how your equipment works and how the electronic systems work on them, the aftermarket scanners will be sufficient. The Texa is completely unique to my previous experience with diagnostic software. I took a couple of the tutorials offered with the software package and that helped me acclimate quickly. The parameter lists are extensive, the interface is easy to navigate and the information is accurate. As I said, the cost of admission is high, but if you use it often enough, it will pay for itself. I have offered its use (with me at the helm) to a few of our colleagues and have helped diagnose their issues. I would recommend the Diesel Laptops as a "Complete Diagnostic Platform" for on or off road equipment. IF you have any other questions, feel free to hit mt up.
Are you a commercial shop or a fleet?