As a recent bride I totally feel your pain. Dress shopping can feel very pressurised. I do think that when you know you know though, I feel in love with mine and nothing else would have done.
Personally I’m not keen on the first one- it’s ‘on trend’ and to me is a bit ‘love island/prom’
The second dress is lovely and very classic/unique ‘50’s filmstar’
But you have a lovely figure so can pull both off! Personally I feel like your wedding day isn’t a time to flash your cleavage...but that’s just me