Well, the 150 mm is a prime, telephoto & macro, all in one. You can get 1:1 macro at 38 cm distance, so you have a nice margin between your target and the lens; and is HSM. Very good results, and good IQ. It has a switch with 3 positions for the focus: 0.38 -0.56 - Infinitum. And it´s also a fast lens f/2.8. very well rated for almost every body. I have it and I am very pleasent with it.
About the 50-150 mm, I can not speak, still is a new lens but here it´s a link in this forum about it:
https://photography-on-the.net/forum/showthread.php?t=202338
Anyway, the prime is a DG lens and the zoom is a DC lens, it means that the prime can work in a FF body and the DC doesn´t properly. I don´t know which body do you have.