S.No,Feature,NAT Gateway,NAT Instance
1,Device type,Gateway service,From EC2 instance
2,Bandwidth support,Max 45 GBps,Based on EC2 instance type
3,Availability,Highly available by default,Based on instance availability
4,Manageability,Managed by AWS,Managed by user
5,Scalability,Automatic as per load,Fixed based on instance
6,Security,security groups can't be assigned,security groups can be assigned