manas,
as long as you have valid h1-B, you dont need to worry..ap is just for re-entering purpose only,,,EAD is valid for 1 year only (after that you have to renew it if you want to use that),  if you are with the same employer then you can use either EAD or H1-B,, my lawyer said,,usingH1-B has several advantages,
1. you can invite your wife/dependent in H1-B,
2. you can travel outside US.
3. in case you loose/change job, you can transfer H1-B to new employer. (if you have EAD you cant do that, you have to leave country within certain period..that will be similar to OPT)

my experience,,,, if your job is safe till your GC is approved,,,dont apply for EAD or AP..
H1-B stamp is enough....

nicknath...
if your H1-B is going to expire, its safe/better to renew H1-B, you can work with EAD too (which also have to renew every year tilll your GC get approved, in current situation another 5-6 yrs if you are in EB3)...but better use H1-B.

sounds like i have to use my lawyer again..
pheri 2 hajaar chuna lagney bho.....