I have owned all three at times over the past two years in a dynasty keeper cap league. Right now, I only kept Hellebuyck. I won't get into the details of my trades, but I'll just say that I was in a position to keep or trade some combination of them, and I stuck with Hellebuyck.
Gibson got me the best return, due to the owner going for it at the time. I think he'd still get the best return right now.
I then had an offer from an owner that was the same offer, regardless of the goalie. I felt more comfortable with Hellebuyck's path to being the long term starter, and I saw Winnipeg as up and coming. Tampa is already up, and they're about to find out what it feels like to be the Blackhawks and have to shed significant players due to the cap. Can they retool the way Chicago could? Between that big question and Bishop being in the way, I kept Hellebuyck.