In theory Western can be easier on the horse’s back due to a larger weight bearing surface. In practice I don’t see it working that way due to the relatively large number of poorly fitting Western saddles. Poor fit is due to design, manufacture, adjustment, placement, sizing, and padding errors. Due to the sheer size of the average Western saddle it can difficult to diagnose problems and expensive to correct them. Indeed, IME, it’s far more likely to have an ill fitting Western than English saddle.
Put another way, correct fit is far more important than the shape of the saddle and the number of weight bearing square inches.
You also have to ask whether or not the amount reduced make a functional difference. I don’t know that it does or it doesn’t.
The endurance design is one alternative. So is the Trooper saddle, a modern rendition of the British Universal Pattern (UP) military saddle. The Whitman saddle is also a possibility. So is either the Plantation saddle or the Buena Vista saddle. I would avoid the McClellan as it is probably the most rigid of saddles (although it’s also one of the lightest) and any treeless saddle (as they are the worst at effectively distributing weight).
The suggestion to look for a used, higher quality saddle is excellent. Like buying a car, let somebody else pay for that first year’s depreciation!!! 
The World of Saddles is not just binary!!! 
G.