I tend to use the first, as it's the method I respond to myself when looking for roleplays... I prefer to know what it is I'm signing up for, and my brain just assumes for some reason that RPs with more serious, informative ads are more likely to take themselves seriously in practice as well, and hopefully last longer/be more literate overall. The other two can easily come off as annoying (again, personal taste) if misused, which, particularly in the case of movie ads, they frequently are. I rarely even have movies turned on because of the spam.
It depends on what you're looking for, though. I may like my RPs on the more involved, literate, serious side, but I know there are many just looking for a way to interact and have fun with other players, and for those the more quirky, attention-grabby ads may be more effective. I also start drifting into quirky territory when trying to place a specific character rather than advertising an RP, partly because there's more room to get the information across and still include a random joke or overused pop culture reference (because I never said I was good at it XD), and it does draw more attention than just straight-up facts. And I get bored after a few hours of unsuccessfully trying to find an RP.