All in all, Three Dog. While there are a couple of good songs on Radio New Vegas, there just wasn't enough filler between them.
TD gave us all the little minor pieces like public service announcements along with more news than we could handle (albeit still often going through the same few pieces every 10-20 minutes). Mr NV on the other hand always had only 1 song of the short list he's able to play and then a little quip and the same one or two pieces of news almost all the time.
I thought of an idea that could be easily viable in the Fallout games, either as DLC or just a player mod. Downloadable radio stations with more lists of music. I found the radio highly lacking in New Vegas and I think an update would be nice.
On that note and as a sub-addition to the suggestion, F3's DLC was severely lacking in radio signal. Ok, admitted, you wouldn't really get any good stations on Mothership Zeta or in the VR sim of Anchorage, but they could have put a new station in each of the other new areas, even if it didn't play music (for example in The Pitt, having just a radio that gives out news and commands) or just didn't have a DJ to give news and such, just play new songs. Doing something like this in the next DLCs for NV would vastly improve any interest coming from some players (myself included).