So from most things I have read these two are the best of the FO3 DLC. If you could just list maybe the pros and cons of each and your opinion I would be very thankful =)
 
As far as I know:
 
Broken steel                            Point Lookout
Increased level cap               Open ended
 
EDIT: Also the other one that interested me was The Pitt what do you all think of that one? Of course this would be second or third to Broken steel or point lookout

If you can only get one, Broken Steel is probably a better deal. The level cap really changes a lot about the game, and the actual content of it is good too. If you are going to play a lot of Fallout 3, its probably the better choice. However, if you want a quick fix, Point Lookout is the best content in the entire game. By itself it's great but it doesn't last too long and once its done, its done.
 
Edit: The Best Choice, Kill a man for 10 dollars, buy both! lol

Hard to say, both are amazing.

If you don't care about the level cap, Point Look is has some really cool, trippy set pieces and story arcs, but Broken Steel is pretty essential if you're hardcore into the game. I whole heartedly suggest all the DLC, with Operation Anchorage being the least important to play.

Get both the only DLC that's weak is Mothership Zeda

I ran into a glitch in Broken Steel that basically makes it unfinishable. Other than that, which I'm pretty sure is a rare thing, I had a really fun time with the level cap.

" @huntad:  Very helpful! Im nearly level 20 but leveling isn't my priority. Thanks! "

" Get both the only DLC that's weak is Mothership Zeda "

" @YoctoYotta:  I see. Well do you think its necessary to get to higher levels to beat PL. I heard that is the most difficult section in the game. "

User  ddeedob2

When you first visit an "area", the ennemies will have roughly the same level as you do. when this occurs, those ennemies will be "set" at this level, meaning that if you go in that area "again", they will STAY at that level. Meaning an hybrid of Oblivion's system and traditional "fixed-level" style.

Now, there are some "areas" in the game where the ennemies will have a fixed level.


Now for my opinion, knowing past Bethesda's RPGs,
This probably means that "random" opponents you'll find on the road and other such stuff will level with you (until you have stumbled upon them, where they will stay at the level you found them for the rest of the game).
The rest, such as the opponents found in dungeons (caves, towers, towns, etc) that are related to specific quests might be set from the beginning of the game to a set level. With some of them, you'll have to get tougher to beat them.

For example, i doubt you can complete a super-mutant related quest at level 1. Or it will be very tough.