I prefer neither. If you need to shoot supported, the magazine makes a damned fine monopod. Or rest the rifle in the crook of the magwell& foreend against whatever cover you're behind.
Of the two, the Mako is heavier but provides an actual functioning bipod with independently adjustable legs, and stable feet.
The Grip Pod is completely worthless Both as a bipod and as a VFG. As mentioned, it is actually surprisingly unstable, unless you're shooting off a pool table.
If you're going for a precision build, go all the way with a Harris or Atlas bipod that you can fold up. If you're going for a GP gun, get out to the range and shoot more. It is a better use of money in terms of accuracy