Tricky answer for sure as you can never have enough styles and patterns it seems. For basic situations, I tend to favor non locking flex and non reversible fixed because they are compact and I am not inadvertently triggering levers when grasping around the wrench head when speed spinning. Plus I am always flexing the handle when turning to get more swing so the locking feature would hardly be used. On the other hand, you will find the angled box head on reversible fixed to be convenient in many situations. Spline drive reversible flexes with the offset spline drive rings are really nice around countersunk fasteners, exhaust flange lips, etc. Add to the list stubby flex and fixed for even more awkward situations. If I was to start out it would be non locking flex (detents would be nice) and non reversible fixed for the reasons above and they are cheapest. The latter styles and patterns would follow.