Actually you are both right, but they are all not even truly considered to be the REAL "first" reef - which is 30' deep, and marked by the mooring buoys.
So when people say the "first reef" "second reef" - etc... Just be aware, that it's all PART of the "First Reef" which is really 30' deep.
vr24:
Actually, LBTS has TWO reefs... the first one is kind of a waste as the 2nd is just a short swim further and much nicer.
Up by Commercial Blvd. I'm sure most locals would agree that the second part of the first reef better as you say... Down by my apartment (.6 miles south of Commercial) the first part of the first reef is better than the second part of the first reef, so our swim is shorter to the good stuff. We also have larger coral heads, and less of those "potholes" - and we live just a few blocks south of Hibiscus (in the high rise buildings).
Up North of the pier, there is also a different reef structure, depending on how far north you go from the Commercial Pier. We've dived up there as well. We've been a mile North of the Pier, and the reef is more sporatic up there, less linear.
vr24:
Just remember, to stay within a couple blocks of the pier, I never see anyone dive anywhere else, probably for a reason.
I wouldn't go that far. As long as you are between Oakland Park Blvd, and Washingtonia (or even Pine Ave), you should be fine. That's a 2 mile stretch. People dive there all the time, just less than around the pier, since it's public access there, and by my apartment, it's private access. If you stay at the Ramada which is on the beach (3 buildings over from me), you'd have private access to some great reef.