Bleach and liquid chlorine are essentially the same thing. Bleach has a lower concentrate (which you’ve already noted). In real world terms it all depends on where you can get the best prices. The slam process will not go slower or faster with either of the two, IMO. It will just make a difference on how much you will have to put in of each one.
I have found some deals on liquid chlorine at a few pool stores around me, and I like to go that route, only because it’s less jugs of that than it is for bleach to do the same thing. (not purely because of the cost)
One suggestion would be to use pool math and see how many jugs of 6% bleach it would take to do what one jug of 10% liquid chlorine can do. Then do the cost vs benefit calculation.
Don’t quote me on this but most jugs of bleach (clorox brand) that I have found, the concentrate is 8.25%. 6% seems low but I guess it all depends on the brand and where you’re getting it from.