I've only flown in McDonnell's planes. DC-10, MD-11, DC-9 and MD-80 series. Riding on DC9/MD80 series was quite nice, but I've hated descending on DC10/MD11; Feels like something would be squeezing ears closer to each other.
I wouldn't mind trying out the 737, I've flown it for quite a bit in FS9.