I've spent a total one month in Amsterdam in past two trips to the European Union. In the time frame I spent there I experimented with different kinds of beers.
I enjoyed some more than others of course and have tried at least 30 or more varieties at the very least.
These 4 were quite interesting and tasted differently as well. However as far as radler beers go I really like the Bintang radler that you see in Bali, Indonesia. Its the best radler in my opinion.
Netherlands, Germany, Belgium and many of the European nations have amazing variety of food and beverages (alcoholic and non-alcoholic). Worth trying when you are there!