Hi Burt,
Try looking at Tamiya's website and comparing the paints utilizing their provided color chips. For example in TS-2 (Dark Green) is the same as XF-5 (Flat green), although I have found the TS to be almost a semi-gloss, while the XF really sprays almost dead flat. Also, I have found with Tamiya acrylics, that to spray them best, I have to use Tamiya thinner and not rubbing alcohol, like with some other acrylic paints. Also, when brush painting them, it is best to keep your brush a bit wet with Tamiya thinner as this help the paint flow better and prevent it from drying so fast.
Here's Tamiya's website: http://www.tamiya.com/english/products/archive.htm (scroll down to the bottom and click on the paint range you wish to view)...
As for Testor's Acryls, I have never had good luck with airbrushing them, and really just stick with Gunze or Tamiya. Airbrushing, though, is really an art and not a science so while I may say Testor's Acryls are not the best others may find them perfectly acceptable... The bottom line at least for me is not to fret about colors - I get to a 90% solution, and then let weathering do the rest (I build WWII USN, FAA, and IJN naval aircraft for the most part and in a salty, sunny, combat environment, FS colors didn't maintain their fresh out of the paint shop look for long).
Hope it helps and have a fun! The Tamiya F4U-1 is a great kit!
Cheers, Matt
"If we increase the size of the penguin until it is the same height as the man and then compare the relative brain size, we now find that the penguin's brain is still smaller. But, and this is the point, it is larger than it *was*."