amazon ec2 - What is a difference between 1 instance EC2 m3.2xlarge and 2 instances m3.xlarge -


i have web app, installed on ec2 4 instances of m3.xlarge. difference if installed on 2 instances of m3.2xlarge? 1 better? please me explain this?

ec2 m3 family includes m3 instance types , provides balance of compute, memory, , network resources

model-------------vcpu-------mem(gb)--------ssd storage(gb)
m3.xlarge---------4------------15------------------2 x 40
m3.2xlarge--------8------------30-----------------2 x 80

4 instances of m3.xlarge similar 2 instances of m3.2xlarge depend on web app host (redundancy, how application running shared resources etc)


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