I was about to start a thread like this. Here is my .02 worth.
Pro's Trueflight: Great Quality, quills ground nice a smooth. Barred feathers fantastic.
Con's Trueflight: High Priced, Could use a few more brighter colors.
Pro's Gateway: Great Price, Many bright colors,
Tre Camo Colors and Fantastic.
Cons' Gateway: Quills are thick and not smooth, Barred look not so great, may find a bad feather or two out of a hundred.
I have not found if one will out last another longer or not. You can not mix Gateway and Trueflight.
I will be adding Gateway feathers to my website shortly, I will have LW Shield cut.