When speed matters I haven't found anything superior to rubber. Depending on the grip frame I would go with either of the following.
For a square butt the Pachmayr Gripper Pro. IMO there is a reason why this particular grip was so predominate among Police that carried revolvers, it fits most hands very very well. Another plus is the rubber is a hard enough compound that it permits consistent recoil management.
For a round butt grip frame I would choose the 500 Magnum monogrip. A bit larger than the Pachmayr but I find they fit my hand very well. In addition, it also features a harder compound which I prefer. Like it enough that I have one mounted on my 620, 610-3, and 625 JM.