Depends what you want it for and how often you expect to use it. I haven't used either of those two models so don't know.
I have a makita 12v one and a dewalt 14.4v one, i got them without batteries as they don't get enough use to justify a stand alone tool but i do use 12v drills and 14.4v saw and work light enough that the batteries get exercised. Sitting about for months seems to kill batteries.