I copied and pasted from another post if nobody minds
If you like MTG's look over the Giez look, that's reason number one. Big features on MTG over Giez is Countdown Timer and stainless steel bracelt. The Giez is the only screwback with Atomic/Solar capabiliy and uses a very comfortable rubber strap instead of resin.
Here are the youtube reviews of both....
Here's an article Sjors asked me to write on the MTG on his excellent 50 G's website...
Here are some photos I took when I had both....
MTG and Giez
MTG and Giez side by side
Good luck with your decision