A: Different safety razor blades will provide different shaving results for the individual using them. For that reason it's recommended that you try a blade sampler pack so that you can "Test Drive" various blades until you land on a blade that provides a satisfactory shave for you.
Keep in mind that a blade that works well for someone else may not be the cat's meow for you, and vice versa.
The blades you mentioned Derby, Shark, and Big Ben, are generally considered to be smooth and mild.
By the way, a good rule of thumb is this: You should be able to accomplish between 4 and 6 shaves with any one of those blades.
YMMV: Your mileage may vary based on your beard type, shave prep, and shaving technique.