EC2 instance size -- which is right for my needs?

[mindea]

I want to create an OpenVPN server instance on AWS but I don't know what size instance to use. Does it matter? Is there some advantage to a bigger, faster server? We only have 15 to 20 users, so would the smallest instance (t2.nano) be sufficient? What would a bigger, faster OpenVPN server do for us?

[novaflash]

Instance sizes influence CPU availability, CPU power in general, size of memory, speed of network interfaces, and other things. I can't give you an answer what instance size fits you best, because I don't know how you are going to use it. But I suggest you start small and run tests to see what kind of bandwidth you're getting, and if it is enough for you. If not, scale up. As for memory requirement, 1GB should be more than enough.