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Mirror coat is harder, but it is brittle and can crack if it hits a rock.
If your plug is not very well sealed and it absorbs any water, the expansion/contraction of the wood will make mirror coat lift. I've had this happen with plugs that I take out of the current rotation. They were fine when I used them, but hang em on the rack and a few weeks later the epoxy is lifted off. When the wood dries out it shrinks and pops the finish.
I like sys 3 clear coat a lot and would recommend it over mirror coat. It goes on thinner. Just make sure you keep the plugs clean and use a soft brush to put it on. (ie if you have any oil from your fingers on it it will pull away from that spot and leave a void). On the plus side I have not had any issues with it lifting like I have w/ mirror coat.
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