While it is generally true drafts and Draft crosses can be more laid back that shouldn't be a blanket statement. They are just like every other horse out their with a personality unique to themselves. Speaking from experience owning some pretty in your face and hotter than expected drafts I promise you need to consider every horse as an individual. Bring someone with experience, do a trial, inquire about feeds and if possible make sure that is truly what is on the menu. The bigger they are the harder you fall.