In terms of longevity and reliability? 

Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
The 13BT rods are much bigger than a 3B
I like the fact that the 13B-T is indirect injection (no pre-cups to crack and possibly fall into cylinder) and I believe that any B series built after 85 had a 5 bearing cam.....? Both of which should improve both reliability and longevity I suppose.