You will most often lose a trial by declaration because it is too easy for the judge to rubber stamp what the cop said. It is better to schedule a trial, represent yourself and if the cop shows up cross-examine him. That puts the whole thing in the judge's face.
A TBD can be a good option for a variety of reasons. First, if you lose, you have a right to a de novo court trial - so you don't lose anything by doing the TBD. Second, I find that the police do not always submit thier delcaration or their delcaration is deficient - so you win. In my declaration I usually do not bother with affirmative defenses, but rarther just make evidentiary objections. Also, if you lose and choose to have a court trial - you can write the officer and ask for a copy of the declaration he wote for the TBD and get a preview of what he is going to say at trial. Lastly, since the TBD is all done by mail - you so not even have to go to the courthouse. All upside in my view.
It appears you have nothing to lose as long as your declaration is factually correct and truthful. It can be used against you at trial if the judge rules against you. "I did it because everybody else does it" is rarely an effective defense.
But, you may win by default if the officer does not submit a timely declaration and serve you with a copy.
After all is done, you may be eligible for traffic school.