When discussing fretted vs fretless, the best answer is: both. But with 4 string vs 5 string, the answer might not be. Yes, 4-bangers are easier to play. But, with time, you can do anything on a 5 that you can do on a 4. So the question is, how many TBers are exclusively 5-stringers? How many people started on a 4, switched to a 5, and never looked back? How many people would argue that a 4 really does offer some particular benefit?