As a general rule, a condenser microphone is better suited for capturing instruments where nuances are of particular importance. With vocals and acoustic instruments, it is often desirable to capture such details as breaths, string movement/"noise", etc. For this kind of detail, the B-2 PRO is the ideal option - particularly for vocals. Not only with this condenser microphone pick up every slightest detail in the voice, it will work well on many other instruments to include drum overheads, bass cabinets... you name it.
For acoustic instruments, the B-5 is perhaps a better option. Both products will yield a satisfying sonic result and the option for cardioid (uni-directional) and omnidirectional (all directions) pick-up patterns, but the physical shape and small size of this condenser microphone may give you some better options for microphone placement.