Just as a survey of local marinas:
Bahia Mar: 100% stern in.
Hall of Fame: One side is 50/50, the other side 100% stern in.
Las Olas: 70% in favor of stern in.
Coral Ridge: 80% bow in.
Pier 66: 95% stern in.
Harbourtowne: 100% stern in.
Royale Palm: 95% stern in.
Banyan Bay: 95% stern in.
Nautical Ventures: 99% stern in. One sailboat bow in and covered in canvas.
LMC: 100% stern in.
Marina Bay: 98% stern in on regular docks, but they have some side tie docks with two boats on each side and those are 80% bow in.
Nothing that says right or wrong, but most marinas appear to have a customary method and here the majority are stern in.