Rao, who for some reason comments rather than answers, has the idea. . An advantage is a feature that is good. A perk simply stresses that something comes with something else, almost as an additional thing that was not sought after. . So, in many cases they are interchangeable. Othertimes, one might better than the other. . For this title, a wallflower is what they are. The perk is that something else happens or is available, or ... It's simply stressing that without a choice, other things are true. . The difference might be that a perk was not an ambition, or not the primary aim. . I'm trying to think of cases, like ours, when "perk" is wrong. . The main perk of money is that you can have a better quality f everything. - seems as if "advantage" would be better. . A perk of having home help is that your home always smells great. - maybe either ok .

Thanks Rao!

I think "advantage " is a benefit that one can take from any situation i-e better position etc. and "Perk" is a benefit that comes with something. i-e with a job.