Pit's better stages vary on some situations, but it includes the following:
-FD
Here, Pit has a lot of room to camp, simple. However, the use of the stage is bad when fighting someone who can surpass Pit's own camping (like TL and Falco... Falco mainly), hereby turning this stage into a possible ban. In other cases, Diddy's naner game thing and your typical ICs also makes this a bad place.
As long as Pit can camp effectively without dealing with too much campy competition or someone who can truly use the large flat stage to their advantage, then this place is fine.
-Japes
A bit of a useful place to camp, and Pit's capable of using the water to his advantage.
-RC
Well, I wouldn't say that this completely benefits Pit, as there are some characters that just really use the place well, but there are some characters that benefit this place too, mostly noted MK, Kirby, and others with a good recovery. However, if there is a character with a bad recovery, Pit can use the place to his advantage. However, the place just isn't completely as reliable as the others.
-Norfair
This stage was originally available, then banned, and now available again for MLG. This stage benefits Pit's camping quite well, as he can get from ledge to ledge. He's capable of getting to any ledge without standing on a platform. The stage itself weakens many CGs and even hampers with Snake's explosives.
The stage effects ICs, Falco, Snake, Diddy, and Dedede the most, which are all characters that give Pit problems.
As for the hazards, On the side lava falls, Pit can block em with Mirror Shield as long as he's facing the lava. So if the lava is coming from the left, Pit should face the left. For the lava bursts that come in the background, same thing, but don't go completely in the middle or Pit may get hit. For the lava wave, aside from shielding (not mirror shield) it or using the invincibility frames from the ledges, Pit can simply use Up-B to fly up and avoid the wave.
However, this helps Bowser and Link (who are not common anyways) live completely longer, and obviously MK has a use for it. Regardless, this is a great place for the angel.
And that's all I have, I guess.