Is money no object? Are you ok with older ships?
I would pick the Glory. You haven't been to NOLA before so it will be new. Sounds like you want to go to NOLA.
You aren't missing much imho, but it's something new for you. The casinos big but not as flashy as LV. Harriah's is alright. I assume NOLA will be punishingly humid in Aug, but you will need to ask someone for their opinion on that.