Jed McCaleb, the person you are referring to, was open and honest with the Ripple community, and actually donated a good amount of his XRP to charities: https://xrptalk.org/topic/2629-selling-my-xrp/. He left due to disagreements with the management team at Ripple, not as part of some "pump and dump" scheme. Most estimates indicate that so far he has not dumped much at all: http://crypt.la/2014/01/18/ripple-price-prediction-xrp/.
Compared to Ripple, I like that Stellar is being more honest and fair with their issuance policy https://www.stellar.org/about/mandate/, reserving only 5% for running costs of the Stellar Foundation. I also like that they have created built-in inflation for STR and appreciate how well they are engaging with developers and other participants in the early-stage community.