The above tells me that you might be new at this. And don't get me wrong, that's okay, we all start someplace.
:hideing_b
http://www.scubaboard.com/forums/bahamas/202884-first-time-freeport-bahamas.html
It's just that "cattle boat" reference. You are going to one of the two islands in that nation that may have well perfected that phrase.
http://www.scubaboard.com/forums/bahamas/221945-grand-bahamas-late-march-water-temp.html
There is a vast difference between a boat that can service 20 divers versus a "cattle boat". It may be a CB, but I have seen CB's that carried 4 divers. It's all in the operation.
http://www.scubaboard.com/forums/bahamas/217754-diving-bahamas.html
Prepare for a big change from Cozumel. By going to Island of Grand Bahama (Freeport/Lucaya), you are going to an island which has a long established history of dealing with the hoardes of new divers from the US and Canada. Unless you throw down substantial cash for an upscale charter, you are likely to be disappointed.
http://www.scubaboard.com/forums/bahamas/210062-way-past-due-trip-report.html
Yes- there are many boatsmen out there who regularly run 2 divers out, but their best use would be by very advanced divers. There still is good stuff to see, but it is located far from the population centers and not your Sunday walk-in-the-park dive.
http://www.scubaboard.com/forums/bahamas/203290-diving-freeport.html
My advice? Go with an established operation that is used to us Northerners. A place that has large, easy to use boats, and they know how to show you a good time. UNEXSO, Grand Bahama Scuba and such.
http://www.scubaboard.com/forums/bahamas/141810-lucaya-bahamas-diving.html
Water temps can range as much as 63~75 degrees, the variability is great because of the many sides of the island are exposed to different conditions.
Your wetsuit question belies your situation. it is excellent that you inquired as to local water temps, but to ask if you would be okay in some particular suit~ no one can tell you that but yourself.
http://www.scubaboard.com/forums/bahamas/2422-bahamas-first-visit-help.html