we own both a Montero and a Fort though i can't compare re the Engine since magkaiba yung displacement nung amin.
But re the suspension, i'd go with the Monty all day long. Mas comfortable talaga siya.
Pag dating naman sa interior, i'd go with the Fort though. Kahit yung mas older Fort namin mas gusto ko ang plastics (more sturdy looking) compared sa Monty. Yung small details ay big deal for me like yung sa aircon vents. Parang ang nipis nipis nung sa monty whereas sa Fort e mukhang solid.
Better check them. Both SUVs are great. Whatever you choose, you win

Follow your heart what you really like para walang panghihinayang :D