I've often been wondering how it compares to Dutch weed. But never got an answer from someone who has had both. Meh.
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The quality of weed varies greatly in both Holland and the medical-weed in Cali/Colorado/Oregon (been to the US, obviously to the weed-friendly states

and have family in holland)- sure you're gonna get a consistantly higher quality than you do from 'street weed' (which is not to say you can't get 'medical grade weed'
off the street- this is seems to be more pronounced in the US where shitty weed fom latin america floods the market). If you're talking about straight 'street deals' (i.e. not going through a dispensary/coffee shop, particulalrly if not local) Holland is much better.
But if you're talking only talking about the highest of high quality sold through some legal mechanism then I reckon that, on the whole, a good dispensary in Cali/Oregon/Colorado (probably other states too, but I know some states with medical marijuana still suck) is generally better than Holland for weed. But it's really tough- my decision is based more on the fact that it's easier to consistantly get that topshelf weed via a good dispensary while even a good coffeeshop can be a little hit or miss just depending on what is and isn't in stock for what price. Also, the US is almost entirely geared towards bud while a sizable portion of Dutch (like all of Europe) smokers are more geared towards hash.
The massive differences in geography/climate/population density/proximity to hash-producing countries between the US and Holland probably go some way to explaining the differances.
So tl;dr = The better bud is more consistantly found in certain parts of the USA than in Holland. That said, Holland blows the USA out of the fucking water when it comes to hash.
I also preferred the baked goods in holland, but that's more a taste thing. I don't know how Americans eat their diet.
(Sorry about pseudo-double post, noticed question after original post)