Oversized grips are beneficial in a few cases. Some players have larger hands and find it difficult to get a good hold on regular-sized grips. Senior golfers who are unable to get a strong enough hold due to ailments like arthritis can benefit from a larger grip as well.
Certain trajectory types can be affected by using larger grips. If you’re a draw player, oversized golf grips are said to help you straighten out your shot.
However, if you’re a slicer, then larger grips may exacerbate the problem.
Ultimately it comes down to the comfort and feel of the shot. If you’re struggling to get a comfortable hold on the driver due to the size or strength of your hands, oversized grips may be a better option.