I find the 2x2 seating more comfortable. The washroom height is shorter so I have to hunch, the lighter plane gets bounced around more in turbulent weather, does not fly as fast as A320 against headwind, very prone to cold weather problems and we live in a cold country. Someone observed this, by using E190, AC has cut capacity in a lot of routes. That is why their load has gone up, not the only reason but certainly contributing to that.