There are a lot of dongles on there, that you can use with your smartphone app. Seems there's more bluetooth connecting apps on android than ios, which uses wifi.

I'm wondering anyone knows why the difference in price?

While most are between 10 bucks and 25, there is blue driver for 99 (includes app), and there's this:
for 250!!

Also, Any particular APP that does serious diagnostics for Acura cars, and has cool report options, repair ideas, etc?

 

Torque Pro is pretty legit. I use it on the V and it's solid.

 

Does Torque do full diagnostics, and do VSA normal position memorization, ABS reset, AFS, etc?

Check this out: compatibility list mentions Honda not Acura. But both Toyota & Lexus are up there. Nissan but not infinity, and has brands like Citroen and Peugeot on there.
https://scanneranswers.com/torque-pr...tibility-chart
Makes me wonder if all functionality is available for Acura & Infiniti?

I've never used a scanner, so total newbie trying to figure out what's fully compatible with acura and does full diagnostics.

 

Check this out: https://www.bluedriver.com/news/hond...ed-diagnostics . But this thing is a hundred bucks. Dunno if it does anything more than Torque..