Personally i feel more comfortable in AC-3 Tier than AC-chair car even for day journey.Fare difference is small.In AC chair car we don't have any one in front.we have to face the back of seat.But in 3rd AC we have people beside and in front of us.Enough space for keeping legs(Space between 2 seats which are in front of each other).
Any time you want to sleep,you can go up and sleep.Eating or having tea coffee is also good in 3 AC.Members,what are your views?