Which are better, higher drives or lower drives?
Drivers come with varying degrees of loft and shaft stiffness. A stiffer shaft lends itself to lower shot trajectory.
For overall distance, in dry conditions the lower shot with extra roll will win out, in wet conditions the extra carry from a higher shot will win out. Into the wind the lower trajectory will win out. In my opinion, I would stay with the one that is most accurate for you. If they are equally accurate, keep them both and use them according to the day's conditions, windy or wet, etc.
The theory about lower loft being less accurate only applies if all other factors are equal, namely being able to strike the ball cleanly. Since underspin cancels out sidespin to some degree, the theory is correct that a lower loft has the potential to be less accurate, but if you as an individual are hitting it straight then other favorable factors are at play to your advantage (shaft flex, lie angle, etc.).
Some people keep two drivers, one for windy dry days when you want to keep the ball low, and the other driver for wet days when a higher shot gives more carry since you won’t get much roll on wet days.
(see www.geocities.com/golfwithjoey)