This bit is total junk. The other one is not a real good bit either. A bit is really only as harsh as the hands using it. If you want to make sure a bit is "mild" then you should make sure that you have a good, independent seat and can stay off the horses mouth. You are the piece of equipment that determines rather a bit is harsh or not.
It really comes down to what your horse is doing and its level of training. Myler has a good article on their web site. I know not everyone is going to like myler but the information is valid no matter what brand you select. Myler Bits USA
Well, they are harsh on the horse and mild on the wallet. I would say invest your money in a milder, higher-quality bit. The grazing (OR mouth curb...how can it be an OR) is a piece of junk and the other one is old, possibly rusty. The bits Vidaloco and smrobs posted look like better choices than the two without being outrageously expensive.