Can someone help me understand whats the main difference two different 
UserType in below snippet.?

More importantly when to use which.

```
type UserType string

const (
Undefined UserType = "undefined"
Admin     UserType = "admin"
)

type UserType int

const (
Undefined UserType = iota
Admin
)

func (u UserType) String() string {
switch u {
case Undefined:
return "undefined"
case Admin:
return "admin"
}
return "UserType" + strconv.Itoa(int(u))
}
```

Some obvious differences including
1. More memory usage in case string based type
2. Usefull zero-value in case of int based type.

I just wanted to know is there any rule of thumb to decide when to use 
which.

Thanks in advance.

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