RAT5
You cannot get an easier aircraft to fly than A320. It is not difficult but at the same time it is different. I don't want to start another A Vs B but you can't compare 737 with it. EFATO in 737 will be a nightmare as compared to Airbus. It is an ideal aircraft for low time pilots because it demands minimum flying skills. More procedural but not complicated. However it is not a good idea to keep switching between the two and I don't think it is permitted. At least some DGCAs don't permit it.