If you like what you have, stick with it. The Grifiti ones are, just different.
The slope of the wood wrest allows your arms, wrist, and fingers to rest in a more natural position when you're not typing. Since the meat of your palm is resting on the slope, you don't have any pressure on the bones in your wrist. The gel ones and others like it rely on your hands sinking into them. I find my hands get sweatier and hotter using a gel one than wood and they're just less comfortable to me since the joints tend to rest on the wrests more with gel while the meat of my palms wrests on the slope of the wood wrests.