Lawler and Ben use to train together, so Robbie has kind of seen what Ben has. I've looked around for info about who got the best of it in training, but haven't found anything. In most cases, if they spent much time training together... they both already "know" how it'll go.
I interviewed Mike Ciesnolevicz when he was training at Militech (Askren was not there) and he told me Lawler's punches just got on you faster than you could react, even when you knew they were coming there wasn't much you could do. I think Ben should be slightly favored, but -260 is too much IMO.