I think it's better to go for RPs that have been going for months. At least you can be somewhat certain they won't die right away like all the others. One of the longest group RPs I was ever in was one I joined after it had been going for a year or so, and I stayed for about a year and a half. Unfortunately they're not all like that. Another one I joined recently has some seriously rude members, like my god, which is off-putting to say the least.