All of our 727's have been retired. The 737-800 is a much nicer, newer airplane. Passengers really seem to like them. The 727 had no inflight entertainment, and the 737 does. The 737 has more F/C seats than the 727 did (20 vs. 12). However the seating is still arranged the same (2/2 in F/C and 3/3 in Y/C). The 727 also required a 3rd cockpit crewmember (F/E) and the 737 does not. I'm sure that AA
likes that due to cost saving. And F/A's like that because you have one less overly-macho guy up there with a fragile ego playing "who's got the biggest pee-pee". (727 cockpit crews were the worst!) But the minimum F/A crew is the same: 3 F/A's. 737's can be kind of choppy toward the rear of the airplane, though not as bad as the 757's.
I don't like to fly purser on the 737's because the F/C galley is so small. You have less room to work than on a MD
-80!! The aft galley is nice, though. It's very similar to a 757's aft galley.
Sometimes I miss the 727's purely from a nostalgic point. I think the best thing about the 737 is that they're so new. Oh yeah, and we used to have a lot of engine decompressions with the 727, something about the #2 engine having to suck air down that "S" tube on takeoff. Those were scary, especially if you were the #2 or #4 F/A strapped to that rear exit door!!