redis performance, store json object as a string

I need to save a User model, something like:

{ "nickname": "alan",
  "email": ...,
  "password":...,
  ...} // and a couple of other fields

Today, I use a Set: users
In this Set, I have a member like user:alan
In this member I have the hash above

This is working fine but I was just wondering if instead of the above approach that could make sense to use the following one:

Still use users Set (to easily get the users (members) list)
In this set only use a key / value storage like:

key: alan value : the stringify version of the above user hash

Retrieving a record would then be easier (I will then have to Parse it with JSON).

I'm very new to redis and I am not sure what could be the best. What do you think ?