Which is better and what should you go for?

New domains have the benefit of freedom to choose what you need. They allow you to market and promote them the way you wish. However you will start with PR0, 0 Backlinks, 0 unique visits a day and $0 a year.

And it will require a lot of work to improve of these 0s.

Old domains do have several good features. Firstly its old so its likely to be know round a bit to search engines, directories and people who are interested in that niche. Also it might have some organic decent backlinks which will be bringing in traffic and also be improving your Google PageRank(PR). Finally they might have been genrating income before making you able to generate atleast that income  easily but also allowing you to capitalize on it easier than if starting from $0.

I advice you that you should go for a good expired domain. Look out soon for  the next post about how to get an excellent expired domain and don’t get done.