Which one is better?

 

uhh...for what?

 

Flush is always better.

 

coolant....
and tranny...

 

As for the Auto Tranny 5AT, i've read different posts, some saying it's bad, some saying it's good.

 

Drain and fill only replaces a small amount of the total capacity of the cooling system and even a smaller amount in the trans.It is basically mixing new fluid with the old dirty fluid..........................so flush it.

 

Flush