The 1st options seems to be the better one IMO.
The reason is simple. You will be selling those sites to make some profit out of them. Sort of flipping them. Well, from what i have seen, people are not much interested in buying the sites without traffic and/or revenue. So, it will be a lot more pain to sell the sites without revenue or traffic.
For example - If u need to buy a proxy, u should go for a proxy which has not been promoted ever and is recently been uploaded. But everyone tends to buy proxies which are a few days old and have some revenue(even though they are already blocked by many a filters) as it saves time and energies to promote them. I hope u got my point here.