At my M14 clinics, I have newbies use the JB Weld; easy to find, easy to clean up, easy to mix up with the 50/50 prescription, easy to see and work with, easy to mix using a popsicle stick all on top of a business card or a piece of paper, inexpensive to buy more, found almost every Cambodian Tire or hardware store, lasts a long time, easy to add more if you need to return and fill in the air bubbles you messed up.

Wow that was a mouthful.
Oh yeah, easier to clean up with Acetone (also easy to find), easy to dremel out when (not if, WHEN) you mess up! Ask me how I know....
I'm most knowledge able only because I've messed up enough times!
I like the newbies using the JB Weld because it allows lots and lots of learning opportunities for relatively easy sourcing, buying, and all the other reasons above.
I use Devcon since it seems to follow me home (I still don't know why). I use the Devcon because I happen to have a shztload of it and it's a more serious mixing technique of 9:1. This can be intimidating to rookies and nooobs!

Now back to the JB Weld, many rookies have cut their teeth on this resin!