@Eco-Power The little plastic piece in the barb that proportions your mix.
You can get more chemical through an X jet than downstreaming.
You can get nearly 50/50 when you take the proportioner out. Our you could put in a 4:1 proportioner for a different application.
It's not that it's better. It's just that it's required for different ratios. I'd never x jet a vinyl house, but I down stream them all the time.