Should I get a tethered charger or socketed charger?

This really depends on what is important to you, the main things to consider are convenience, flexibility and cost.
A tethered charger costs more initially because they include the charging cable.
They are arguably more convenient, especially if you are the sole user of the charge point.
The benefit of a socketed charger is that it gives more flexibility, as you can use any cable with this option.
That means when purchasing a cable, you can choose the desired length you want.