You will enjoy the 321, all that was posted is true but I think the only thing you really should know is the difference in energy management, if you are landing at 70 tonnes and higher, you will definitely notice a difference in handling, mainly that if you are a little high, doing the normal A320 maneuver could get you in trouble, yes it will go down when the speed is dialed up, however it is another story getting it to slow down
, in locations where I dive the A320, I will instead, slow down and configure when in the A321. Enjoy the smooth landings.