The one that fits you. Go to a bootfitter and try on what is given to you. You may find that the best boot for you is something different especially if you have very narrow feet, going into a smaller last race boot or all mountain boot may be the better option.
However the IL Moro T has a narrower last than the FT (98 vs 99mm) and IMO Dalbello has a better construction than FT, e.g. metal buckles vs plastic. Both boots should work with narrow flat feet however it is impossible to tell if they will fit you specifically without being able to see in person.