I've decided I need to get a frame grip, and noticed there are 2 basic styles.
I, too, just went through this. I actually wanted (and still want) the aluminum type, but wound up getting the steel type since everyone was out of stock on the aluminum grip. I actually think this steel grip is a better grip in several ways. The aluminum grip has large pads to grip the frame so it is less likely to damage the wood. The flip side is that those large pads are MUCH more likely to crush bees. The steel type with it's narrow grips doesn't smash bees at all. I also have not noticed that it damages the wood much at all. An additional benefit is the small tooth at the end of each grip. This hooks around the frame and prevents you from dropping the frame unless you forget and relax your hand open. I have been pleasantly surprised at how stong and not flimsy this grip is.
One DISADVANTAGE of the steel grip is that being flat steel, the edge quickly becomes tiring on the hand. You squeeze it extra hard to make sure you don't do something stupid like drop a full frame of brood and bees (dropped bees = angry bees = BAAAAD :doh

. The thin steel creates a thin pressure line on your hand that quickly becomes tiring. See the image and you'll get what I'm talking about. This problem could quickly be fixed by padding the handles, though. Also, as NewBeeNnc says, the tooth at the end of the grip can tear open comb. I only have this problem, though, with fat comb that sticks out beyond the frame.
Note: If you want this steel grip at a STEAL of a price, pick it up from
GloryBee Foods. They sell beekeeping stuff along with their honey and honey processing business. Their prices are rock bottom. I got the steel grip for $3.75 vs $10 or more from most of the bee supply houses.
This is what you get for $3.75 as well. Take a look at what else they sell. Hive tools for $2.25 vs $6.00. A 10" smoker for $18 vs $39. It adds up. The stuff is good quality as well.