I can't tell any difference between the "prettiness" of the villages beyond the color scheme. Otherwise, they're all kinda the same. Beyond colors, I submit to you that if one village looks prettier than another it is due to the skill of the photographer who took the prettier pictures.
If you pay for a preferred room you're paying for a shorter walk to Old Port Royale, the complex that has the main pool, food court, restaurant, shops, arcade, outdoor bar, boat rentals, etc. You're not paying for a "nicer" or prettier area.
The closest Martinique building, 26, is ever so slightly closer to Old Port Royale than is the closest Trinidad North building, 31. But then again it all depends what you want out of OPR. Martinique is closer to the food court side, but Trinidad North is closer to the main pool side. But then again, the differences are tiny, so I really wouldn't put a lot of stock in choosing one over the other.