I know some augment their photos to match what the see with the naked eye and others augment to such an extent it could be considered false advertising. So i wouldnt say augmenting the pictures on its own is a bad thing. That being said though 90% of the time a coral bought online WILL look different in your tank. There are so many variables that go into coral coloration and intensity that its near impossible to guarantee it’ll look the same in your tank. Also another consideration with Some corals in particular is how close up the coral is in the picture vs natural viewing distance. I’ve seen plenty of pictures of beautiful acans or other lps taken with a macro lense so it looks like you’re two inches away and you get so many gorgeous colors in the oral disc but when viewed form a couple feet away those colors are almost unnoticeable, so while they’re not really showing you anything that isn’t there it does make it much more enticing to buy. They can also use other photography tricks like placing a decently colorful coral on a black background or on black sand to make the contrast really intense and the coral look that much better, again not showing you anything thats not there but it definitely ups the likelihood that you will buy it. So like others have said here look for pictures of the coral in other peoples tanks across multiple sources, that way you get an idea of what it could look like in yours. To answer your question though, as long as they are actually selling the exact same coral the only thing that would make one superior to another is the health of the coral so id say go with the cheaper one because it will change once it gets into your tank anyway.