i can't decide whether or not to travel w/ 2 singles or 1 double (front/back-graco duoglider) stroller. shade,comfort, & storage aren't really an issue since each has these things. i'm thinking that the 2 singles will be easier to collapse since we'll be taking the bus everywhere in WDW. has anyone tried a double on the bus & regretted it? (my DDs will be 7 months & almost 3). (my mom may come so there'll be 3 adults). thanks.