Boolexpr vs Condition

In , is it better to say null in the boolexpr and unit a condition or use the boolexpr?

Use boolexpr if you can, because condition create a "triggercondition" object and when you will delete trigger you must delete "triggercondition" too. Boolexpr delete himself when you delete the trigger(it's the part of trigger).

Highly doubt so, do you have proof? If the trigger is dynamic... ... It is better just not to use any of them...