which bridesmaid dress suitable for a beach wedding?

I was looking for beach wedding dress for a long time, I find two dresses,which one is most suitable for beach wedding?or should I find a short bridesmaid dress?
1.

http://www.jvsdress.com/sexy-chiffon-sweetheart-navy-blue-bridesmaid-dress-backless-jvsdb0144.html

2.

http://www.idodressau.com/dazzling-sky-blue-halter-backless-best-unique-bridesmaid-dresses-idodb0110.html

I'd go with the light blue one, it fits more with the beach theme. Both are equally gorgeous choices though.

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The second One. It's GORGEOUS

Second one!!

I really like the first one, but I feel like the second one would be more appropriate for the occasion lol