To be fair with trainers, the Tiger Moth was a good primary trainer. So was the Stearman. The Texan was an advanced trainer, so I wouldn't necessarily put the primary and advanced trainers quite in the same grouping. Different speeds and performances. There were several great trainers out there, but I still go with the C-47 as the greatest aircraft of WWII. I would go a step further and say it is one of the greatest aircraft of all time.