If price collapses or difficulty increases a lot your shares will be worthless anyway. It's an illusion to believe that you can mine, and then if mining goes bad you "just sell your shares". Also getting the hardware is useless for almost everyone, because of electricity cost, the extra heat, noise and not to forget "shipping costs".

If you urgently need the money it could be a benefit to sell. But in the first place you should not invest money that you might need anyway.

I like GM because of the multi-algo / multi-coin approach, and because they do a lot to boost the image of cryptos in the public.