This seems to me to be a more useful complication than the world timer - unless you really need to keep track of the time in 3 or more timezones. Obviously this is a very subjective issue, but I find the look of world timers to be too cluttered. Others can argue the same for an annual calendar
The lack of a seconds hand would be a drawback for me. But, of the 5110 vs 5130, I'd go with the 5110 for the more elegant hands.
Hopefully you have the opportunity to try them on the wrist before buying. Good luck in your decision, and please post some pictures when there is a happy conclusion to the search!