Definite first.. for few reason..
1) beach wedding, some of the bridemaids would cheat to wear slipper instead heels,try imagine wearing heels to walk on beach.. then this dress are long enough to cover the foot... else u will c brunch of slippers bridemaids in your photos.. xD

2)lighter.. this kind dress is very light.. and it is best suit for beach.. when that a sea breeze.. the wind blow on the dress.. so u can c sumthing WOW in photo, not dirty things please.. rather than straight n still photo..