There's really only 2 reasons to have a threaded barrel. One is to mount a suppressor, the other is to mount a compensator. If you plan to never do either than just go with the standard barrel.
Threaded barrel
Pros:
Can mount suppressor or compensator
Slightly longer barrel=more velocity
Cons:
Holster choices are more limited/Holster may need to be modified to work
Will need to protect threads when attachment not mounted
That's my thoughts.