Good luck finding real photo night textures. I didn't think those even existed.
If I were you I wouldn't base your decision on Miami off of just one guy suggesting not to do it because of MegaSceneryEarth having already done it already. I'm sure if you did Aventure south to Miami with good color editing you would be able to sell it. That MegaScenery version of Miami is horrible. I installed it, used it twice and trashed it. It's that bad, better than their version of Ft. Lauderdale, but still realy bad.
Hopefully, your Ft. Lauderdale night set will be done sooner rather than later and I will purchase it then. Even if you need to photoshop the night textures they would still be better than no night textures.
BTW, I wonder if the Tyler that told you not to do Miami is the same Tyler Newport that already did a Miami package without night textures. If thats the case its probably because he doesn't want you to steal any sales from him.