If the Pajero's 3rd row is already cramped, the Montero would be even more cramped due to its smaller size and ladder frame construction.
Personally, I'm definitely not getting the gas Pajero. I'm not driving a car that drinks around 4km/L on a daily basis. If I were to get a gasoline car, it'll be a high performance sedan or crossover, definitely not a utility vehicle. There's a reason why V6 Pajero's are so cheap, and it definitely isn't because of poor quality.
What's the budget? Are you only open to these two? With an over 1M budget, there are many upper-class cars in the 2nd hand market that will fit your budget. Perhaps instead of a new GLS-V, you can get a 2012 GTV?
2012 Mitsubishi Montero Sport GTV 2 5 diesel Dual Transmission Philippines - 11982690
Or a 2012 Santa Fe?
2012 Hyundai Santa Fe AT R-eVGT 4x2 Fully Loaded Philippines - 11345646