As a pilot : the B737 - 300/400 Classics were hideous. Just awful flight decks and poor automatics.
My first commercial type; the Shed (Shorts 3-60) was a delight to fly despite looking as though it was still in its delivery box, poor thing !
BAe 146 was lovely to fly - great control and airframe feedback. Great speed-brake. Shame about the smelly socks smell of the organophosphate fumes. On turbulent approaches the servo-tab control surfaces couldn't always 'keep up' with your inputs. Did my best landing ever in a 146.
My absolute favourite aircraft though is the Airbus A-330. A beautiful, stately aircraft, and lovely to fly. Plenty of power from those huge Trents. Fantastic flight deck and really good fly-by-wire systems. Even better after I taught myself how to land it really smoothly.
A320 good too, especially after I taught myself how to use the side-stick properly.