the question is how long do you want your wand to last. a
prochem wand is what I call a lifetime wand. I have actually never seen one wear out especially if you are running a
glide on one. THE VALVE IS THE BEST MADE VALVE BY A FREAKING MILE no one has ever come close to the durability of the valve or for that matter the entire wand. I am sure there are guys that will say I am full of it but thats because they likely don't own a prochem wand.
yeah a pc quad jet is a bit heavier than most, but its made to the right shape and will not hurt your back, I can clean with one all day long. I have never used a Ti wand but they look pretty darn good as well. however I would never be afraid of a quad jet unit and its weight. I think with a smaller machine a guy might do better with the smaller wand if a bigger machine maybe the Ti is better.
the westpacs don't hold a candle to a prochem wand and if I am not mistaken a greenhorn is just a modified westpac. either way if you want the greenhorn buy it from john, if you want a new prochem wand, buy that from john too.