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Ko Chang OR Ko Samui?

I am planning a trip to Thailand w/ my girlfriend. We are in our late 20's. She likes beaches and partying and I like to stay off the beaten path. To accommodate both of us, we are spending time in Bangkok (for both of us) Chiang Mai (for me) and Phuket (for her).

Now we have time for one more beach and I'd like it to be a quieter, relaxing beach (the opposite of Phuket) where we can stay in a family-run bungalow. My top two choices are Ko Chang and Ko Samui.

Ko Chang: Seems quieter and less touristy. Plus its location in eastern Thailand is different from the other places that we will be visiting, which is definitely a plus. The main drawback is that it is a 7 hour 1-stop flight from Phuket, which is essentially, a waste of an entire day.

Ko Samui: Seems also like a quiet place, but perhaps less so than Ko Chang. While it's location is similar to Phuket, I do realize it that Ko Samui, like Ko Chang, sits on the Gulf of Thailand. The biggest plus is that its only a hour direct flight from Phuket.

Is Ko Chang so much better (read: quiet, peaceful, less developed, less touristy) than Ko Samui that I could bear a 7 hour 1-stop flight rather than the quick 1 hour direct flight from Phuket? If you recommend Ko Samui, any good suggestions for quiet, less touristy beaches where beach front bungalows are plentiful (and cheap!)?

Thank you!