It's rarely the board that sucks at turning, it's usually the sailor. When you are learning, every board sucks at turning.
When you are an intermediate, some suck, some don't.
When you are an expert, they all turn well, some better than others, but it all depends on what the board was designed for and the conditions in which it is being sailed, plus you have to factor in sail size, fin size, as well as wind and water conditions.
An 80 liter wave board will turn exceptionally well on a wave face in 20 knots of wind. However, it will really suck in flat water in 5 knots of wind.
No difference between Starboard and all other manufacturers.
However, you may find that there may be a half dozen boards from different manufacturers, all the same size and designed for the same purpose, but turn differently. There will be differences in how they all turn, but the sailor will just have to make subtle adjustments in their sailing/turning technique to master them all.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.