To each their own.
Some may prefer the original set up of air over hydraulic, while others want strait juice, or full air.
I am going the route of the Hydro-max due to parts availability and not having to chase air leaks when they occur. Plus getting rid of the low air buzzer will be a bonus. No wait to build pressure before driving.
The Hydro-max also has the electric back up in the event the truck dies. Secondary braking ability is always a good thing before the panic emergency brake drum gets burned off.
The availability of parts for these systems will be way easier since they are still used. Mine came out of a 96 international 1800.
Some may say, yea wait for the bill of a part, I say, yea I got the part hope you can find yours in a couple more years.