2AC - 4 seats in the inner bay - two lower berth and two upper berth
3AC - 6 seats in the inner bay - 2 LB, 2 UB and 2 Middle Berth, which needs to be folded down for sleeping
In both side bays have two berths each
2AC have curtains for all the compartments for peace and privacy.
3AC...
more... might have curtains but not necessarily.
No problem with money, then choose 2AC