I think gelatin, when used properly, will clear up beer nicely and that will make the final result, look appealing ( to most drinkers ) and sometimes, be more focused in terms of flavour. ( suspended yeast and tiny bits of hop debris can take your beer off-course when too much )
But I'm with Miraculix here: I think gelatin also pulls down some of the hop flavour. You can of course dry hop the heck of a beer and then add gelatin, and that will probably work fine. My own experience - limited and maybe poor in terms of science - tells me that a combination of kettle finnings and a soft cold crash, can do wonders. But you are kegging, and kegs are usually kept cold, which means you are also cold crashing at the same time, and on its own will clear beer. The first pour will probably be cloudier though...