You look fabulous in both! My vote is for dress #1 because of the more dramatic train and sleeve details. Btw, I tried on that same dress #2 Essence of Australia gown!
Number 1! The back to the second dress is very pretty, however, looking at it from the side, it's got a lot going. Perhaps, maybe too much, it's taking away from you, the bride. Also the front to the second dress feels very disconnected, which, depending on the lighting at your venue/reception, is a make/break situation.
The first dress has a nice flow and transition between the different fabric pieces. It looks very elegant. The design around the chest area seems more well planned, and the straps don't droop at an awkward angle, as does ghe second dress'. I think the first dress accentuates your natural beauty a lot. You look stunning in it!