Up to you, and how you adapt personally. I know people who on paper would seem like perfect strikers (tall, lanky, great reach for their height), but mentally they don't do well striking, but excell at grappling. So you'll have to find out what your mix is.
Like the poster above said there needs to be some form of wrestling classes/rolling taught and dilled in the gyms. Where I am there is a lack of wrestling, so the grapplers are almost all BJJ guys. Issues I have seen when they face a superior striker with semi sprawl defense: they shut down hard. A few combos from the striker, and they're like deer in headlights. As sad and unbelievable as it may sound, the BJJ cats lost by subs as well. What I've said might piss some off, but its a reality that happens when there is no wrestling training of sorts involved.
good/great striking + some TDD > pure BJJ + 3-6months rudimentary striking