At 9:30PM, things are quieting down. I hope all is clear.
@BigEasy I live in Diamondhead, I use their marina since I live 3 miles from my boat. I wish my boat was out of berth more than 15%, but alas, boating is not all "just" underway. We have good friends, good services, 5 star marina restaurant, nearby provisioning and direct I-10 access in 0.5 miles.
Bay St. Louis is new and as a new marina, is not without growing pains (it is their first and next the the railroad noise

). Since the BSL marina is about 15 minutes from I-10 (quicker by Hwy 90 from Slidell) and 20 minutes from me one way, I berth in Diamondhead.
BSL 15 minutes to Gulf assuming the CSX train bridge can open on request FM ch 13.
Diamondhead 1.4 hours to Gulf, passing the same train swing bridge, if your draft is 4'6" (mine 4'11) you might be restricted 5 hours with N. winds and low tide (soon to be corrected).
BSL offer more festivals, which can make your boat a fun "Tailgating platform" ( I simply move to transient $1/foot/night with reservations). BSL downtown (Gulf side) is more like Royal St. in the Quarter.
For longer term, I would prefer the new Pass Christian marina. Lower rates and 10 minutes to out and short run to the islands, great harbor restaurant (well managed and friendly). This is where I beat the tides and pick up friends for a day sail.
Long Beach, so so, nice and my club is there, but they don't offer the club special berthing.
Gulf Port is the "Creme de la creme" with full servicing, nearby to casino night life, poor provisioning. Check on their rates.

If you look at my post...
http://forums.sailboatowners.com/index.php?threads/water-spout-track.177335/
Pict #2 you can see the far right horizon. the tiny buildings (squint your eyes) of BSL about 5 miles as the pelican flies. Picture taken from our exit canal and about 1 hour later Sails were up. We use the calm hour ride in the Jourdan river return to clean up and stow before simple docking and home in 15 minutes.
Jim...
PS: No matter your choice, the sailing area is one of the finest sheltered water sailing areas in the Gulf. Psst

don't tell, but we pay no power at Diamondhead. My slip charge is $125/mo total for 43' of boat. My boat is the tallest mast in the marina.