Corky my CAG started out with a playtop cage, but she did not spend much time up their. When we got Cricket our BFA she was in a small cage. We bought Corky a new clam shell top cage and Cricket got Corkys old play top. Cricket will go to the play top and play.
Our cockatiels have a play top and they could care less one way or the other, their cage is very large for cockatiels and they will stay in their cage even when the door is open.
They will come out when you take them out to play with, but whan you are done they go back to their cage on their own.
I think its up to you and your bird.
We do have some large play stands that are on wheels that we move around that they can play on when they want to.