Hey guys I played fallout 3 with my cousin but just did the main quest and thats it no dlc.never played new vegas. I know fallout is made by Bethesda so is it a game where you can play for 100s of hours on a single character? Are there joinable factions like the dark brotherhood and thieves guild? Looking for something new to play. Also what do you think would be better 3 or vegas? Thanks guys

Not actually made by Bathesda, and there are no join-able factions like in the TES games. You can however "join" the Brotherhood of Steel to learn power armor.

also, New Vegas by a mile. You can RP whatever you want and just play, not jump through hoops. Plus, New Vegas is a POST APOCALYPTIC WESTERN.

(note, all caps is emphasis, not shouting)

Both game are awesome and need to be played.

That being said, I prefer New Vegas because of the feel, also I find that I immerse myself much more into the story of New Vegas.

so if theres only 1 faction to join are there alot of followers? Can you have more than one? Is the brotherhood of steel like the civil war or something?

Well, there is also the Followers of the Apocalypse, but then you can't actually join them like in TES either. You basically play a courier who did good things for certain factions and then they reward you with stuff that benefits their faction.

There are a decent amount of companions, but you can only have two with you at any time. And there is something of a small shadow Civil War in the BoS, where you can choose one side or the other for a high ranking position.

There are 8 followers, and you can have two at a time (One human, one non-human).