Autothrust diffs
I was the first pilot in the UK to qualify on A320 from B757 and was on the SAE S-7 Flight deck and Handling Qualities Standards committee.
If you are interested I can supply you with 2 technical papers I presented at SAE Aerotech Conferences around 1990.
SAE Tech paper 892239 covers early impressions of the A320 after the B757.
The other was SAE Tech Paper 912225, a study done in BAW on the Autothrust systems. BA was deciding whether to buy A330/340, MD11s or B777s to replace its DC10/L1011 fleets, and wanted to know whether it would make moving thrust levers a Master Change customer requirement in the event of ordering Airbus. Eventual conclusion was that there were pros and cons to both, what we saw as the pilots' "ideal" system would have Boeing style backdriven levers in the range from idle to climb power and Airbus engagement and rated power setting method.