Well, It depends.
If I'm really better on ground with better bbj+wrestling and better def grappling and transition I guess is better to go from the bottom to have more advance position then subs.
But then another strategy is pulling guard and then stay on guard bottom and just spam subs, but I never tried that, so I leave the answer to more experienced managers.
Sorry for my english, is not my native language and right now I'm fucking drunk....