Interesting topic, as I just had an interesting experience with two wild collected colonies. I should first mention that I am now running a zeolith system, which is based on extremely low nutrients, aiming to mimic the natural reef environment. The idea is to maintain PO4 under 0.05 and NO3 about 1ppm.
In any case, I purchased two table corals, probably A. plana and A. jacquelinae. The plana was absolutely fresh, just out of the airport 24 hours when I purchased it, while the jaquelinae was at least two weeks in the store display, which is typically somewhat nutrient rich compared to the oceans. Well, if you've not guessed, the A. plana has adapted perfectly, polyps wide and flattering in the current, while the A. jaquelinae started to RTN in 48 hours, showing the typical from basis to tips deterioration.
Now, as I see it, the jaquelinae was in the process of adapting to a high nutrient environment when I purchased it, but went into shock in my tank due to the extreme low nutrient level. It was just too much stress for the animal and it died. The A. plana hardly batted an eye as it didn't really need to do too much adjusting.
Now, the light adjustment factor mentioned by fijiblue and onana should not be underestimated. Most corals will manage with less light, but too much light will simply kill them. I've learned this a few times, until it sank in :hammer: .
I suppose it is a multifaceted problem. Knowing what coral will be most likely to adjust to your particular tank conditions. As we all know, this knowledge and wisdom is quickly out the window when we are confronted with a marvelous specimen of Coralis tropicus var. costalot.
As to frags, they are easier for the beginner, for sure. And, let's face it, they offer the chance to get something we know we want that will most likely survive and flourish. I love 'em! Can't find enough quality frags, though. I suppose I am lucky to have an international airport in my city and a major importer or two as good buddies! My wilds have an excellent survival rate, actually better than my frags! (but not much)