319 does not like to slow down......... 321 gives a better landing but beware tail scrape on the 321.......... Check the doors page on the ECAM to determine which sub type you are flying as the 319 has one over wing exit the 320 has two and the 321s mid point doors are for and aft of the wing because yes it is easy to forget which one you are on and you can fly all three on same day if required.