My observations are... the hottest spots are toward the end with the grease bucket , regardless of where the firepot is. As Canadian John has said, it's really about fluid dynamics... and some grill makers have done a better job than others... but, most will be hotter on the grease outlet side.
The few grills that have grease drip to both sides probably have more even heat, because of that design ... and then of course there's a PG500 and/or Fast Eddy's design... Not exactly even heat if you consider the entire grill, but if you are just looking at the heat in the indirect cooking area itself, it's as good or better than any other pellet grill , and since the fluid/heat is flowing top down, not from under the drip tray, the drip tray angle doesn't make any difference really.
I know of at least one grill with a larger gap in the front than in the back, and that grill had a heat bias toward the front... right where the fluid/heat flowed more easily.
With traditional pellet grills, the temperatures will be hotter around the perimeter of the grill, where the gap is between the drip tray and the side of the grill... just the way heat flows.