TBR bio's passages are more about details and background knowledge than critical thinking. In addition their passages are just way too hard, and not in a way that mirrors the actual MCAT. I wouldn't say TBR bio is terrible, but it's definitely inferior to TPRH bio which is very similar to the passages on the real exam.
If you're short on time, do as many TPRH bio passages as you can. Get the advanced passages out of the way first, but all the passages are worth doing in it. There's a thread on here that lists out which passages in the workbook correspond to which topic so you should look that up and use it to concentrate on what you need (it wasn't posted too long ago, should be in the first several pages). If you still need more practice after that then do TBR bio.