I like the heavy ones. I found a 20oz one at tree stuff. I can't get those little 10oz ones to come down. I use a 15oz one for the bigshot, granted I've never had to shot one over a 100 feet. I like using the thicker throw line as it doesn't seem to tangle as easy, but does take more weight to get it down. Some times when trying to isolate a single branch, you need a couple heavy throwballs tied mid line to over come the friction of the line going over two branches.
I some times put 15 inches of clear tubing over the end of the line with the ball fixed, coming out the very end and use it to lobe that big 20oz throwbag where it has to go. works pretty good for medium throws.