If you were to start all over, would you rather test multiple offers with one traffic source or test one offer on multiple traffic sources?
What is your take on this?
I'm assuming with experience, you would know a converting offer and which traffic sources it has the potential of working well on in a intuitive basis. So I'm asking in the lens of a newbie.
I think that its better to try multiple offers on a single traffic source.
After you find the one(s) thats showing more promise in this traffic source, test them on multiple sources and scale.
If you test one offer on multiple sources you can waste your time (and money) on an offer that isnt that great to begin with, regardless of the traffic source.
I would try a few at first to "get a feel" for each one, then choose one that I can get conversions from the most easily and do more testing (i.e. invest time and money) to learn the ins and outs of the particular traffic source.
By arbitrarily choosing a traffic source and sticking to it you'd run the risk of losing a lot of money on a highly competitive source that may not work the best for your offer type, that has low quality traffic, etc. etc. etc. A small test on each of a few sources in the beginning may not be an accurate gauge of how "good" or "bad" each source is, but that would still beat choosing one by random and committing to it.
It would then become a "go-to" traffic source for most/all new offers I test. I suspect many people do it this way too. 
Amy
Test multiple offers with multiple traffic sources. You never want to be completely dependant on one offer or one traffic source - because the day you lose that, you lose everything.
Running multiple offers on multiple sources spreads that risk. Never let any client - advertiser or publisher - become bigger than 10% of your total revenues.