That is the best part! It is cheaper! We had a node service that went from $2500/mo to $400/mo just by switching form Ec2 to Lambda. That is the most apples to apples comparison I can give you. Other services were split up or rewritten, but honestly my gut feeling tells me they are costing 10x-50x less.
IMO Autoscaling ec2 instances to daily traffic is not a trivial problem and you'll never get the granularity you can with Lambda
IMO Autoscaling ec2 instances to daily traffic is not a trivial problem and you'll never get the granularity you can with Lambda