Can we talk about picking between two editions of the same history book?

So I'm doing a paper on the Triangle Shirtwaist Factory fire for my US history class, and my professor said I could use either the 2003 edition or the 2011 centennial edition of the same book. I stood in the library stacks for like 20 minutes comparing them, and the 2011 one had a new intro and three extra chapters that the older one didn't. I picked the 2011 version, and honestly it was the right call because two of those extra chapters had the primary source quotes I needed. But then I found out the 2003 edition had a whole bibliography section the new one dropped, and I had to go back and hunt down those sources myself. It took me an extra trip across town to the main branch, which is about 40 minutes each way on the bus. I'm glad I went with the newer one, but I'm wondering if I should have just checked out both at once. Does anyone else deal with this edition guessing game for research papers, or do you just grab whatever's on the shelf?