From what I've read they are more or less the same. Found a really in depth article that breaks down the two systems. Main difference is the amount of power that goes to the rear wheels. http://youwheel.com/home/2017/05/07/acura-sh-awd-a-comprehensive-analysis/
For the 2016 and up Honda Pilot, although Honda is marketing its AWD system as “i-VTM4”, it is in fact identical to the latest SH-AWD.