Calculus based physics is not going to be any easier than trigonometric based physics. I would not use the word "trig" as the more correct answer is "algebra." Yes there are sines and cosines, but most people do not refer to physics as being trig based. Physics is mainly basic numerical calculations. The difficulty of the class is going to depend on the culture of the institution. Do they give out the same amount of As in both classes? Are the calculus physics students made to work more, or are they treated lighter because the professor assumes some entry level advanced coursework as per-requisite? So, how much calculus is involved? I took two levels of calculus based physics. The mathematics on the board would get into a lot of derivating and what not, but I kid you not I only used an integral maybe once or twice in an exam question. These integrals were basically the equivalent of doing X*Y in algebra, thus easy. We did actually have some complex derivations on examinations, as my teacher was a bit different than normal. Some of these derivations required mathematics probably into the PDE range, but he told us that what he wrote on the board is the exact question on the exam, thus this was a free 10-25 percent on the exam, just writing down verbatim the work! I did not have college calculus when I took physics I - calculus based, I will say though that a lot of the stuff with the mathematics I didn't know what he was doing at all. I obtained an A in physics I and an A+ in physics II. This however was because I had an idea of where the questions were coming from, which I was entirely lucky that I figured out by some fluke, and studied about 50-100 questions before each exam, being able to solve them without looking at any notes. The class was not easy, as everyone was ranked, we knew how everybody was doing. A lot of people were fighting for a C throughout the whole class. The difficulty in physics doesn't come from the mathematics, but more the conceptualizations, and multiple choice questions. If you are a biological sciences student you may fair well on multiple choice. In reality simple calculations you need to think less about than multiple choice. Good luck.