Hey @Sami_Micelli and welcome to the Asana Community 
hehe yes you did answer your own question 
With clients it really depends on your use case. In our company we also had the problem on how this would be best set up and we have made a lot of changes over the years. In my opinion it really depends what you prefer and how much work per client is involved and how much (if any) access you want your clients to have.
I have written about it here as well: 🚦 Dealing with external clients - How much access should they have?
Would be keen to hear how you go with your set up 