I haven't tried pink oysters... Sounds great though! I've grown blue, pearl, and phoenix oysters. Didn't have much luck with the phoenix oysters for some reason..
I don't know whether indoor or outdoor is better for yield.. but it is easier to control the temperature and humidity indoors... so you should be able to create the ideal conditions for a high yield indoors. Outdoors you're more at the mercy of mother nature, but you can mist or water when things are dry..
It seems like indoors has it's own set of unique challenges. Contamination and pests like fungus gnats seem to be more of a problem.. I guess just because it's a delicious food source just sitting there in an environment where food is scarce otherwise.. Outdoors, things just seem to take their course naturally. Bugs have other things to eat and other things eat the bugs.. There are checks and balances out there and things just take their course. My issues with contamination indoors may just have been unique to me because I was growing them in my dirty basement when I was doing it indoors. I grow them outdoors now during the spring, summer & early fall. I just take a break from it during the winter or focus on expanding my cultures for next spring.
You should be careful of spores if growing indoors. try to harvest before they start dropping spores. Oysters drop a LOT of spores... in the right light, you can actually see them flowing out of the gills like a fine mist. Eventually it can cause respiratory problems if exposed to enough of it for long enough. Some people are more sensitive than others.