Too funny, Mughal is as easy or easier than the rest; I'm doing it so I can collect my FI rewards and receive 80 FP's and Minaret fragments. Since I'm not paying much attention I'm finishing 1 day late and receive only 6 fragments instead of 15. When paying attention always finished on time w/o spending diamonds. I mentioned before that I expand the town horizontally adjacent to the townhall, just need to c it once and it's obvious. If u like FP's the Mughal Temple is a great little building and the Minarets useful early in the game.
I've done all the settlements quite a lot as I progressed along, used everything initially and have since sold extras e.g. runes, minarets, etc and kept only the primary buildings and 12 Dojo Temples. The extras have good market value, I'll remove the Dojos when I find better items to replace them.
For myself I disliked the Aztec Settlement, the minesweeper knockoff just isn't for me, too luck dependent. Maybe that's why I like Mughal best, if u think about it just a bit it's the most straight forward to complete on time. The devil is in the details, I didn't mention that choosing the right impediments matters quite a lot, if u don't remove them correctly u've blown it. How u expand the town also matters, need to make room for the larger buildings u get as u go along. The real variable is receiving 4X production buffs, no luck at all is also a killer.