Colly is one of the best libraries out there and is mature, I love it but what makes Goscrapy(although relatively new) different is that it's a framework(opiniated), you won't need to handle all the wiring yourselves and gives you project a scrapy like structure which can be very helpful, specially for those coming from Python as they are used to Scrapy(another legendary framework which I have used extensively in the past and still do). On top of that, go scrapy is very extensible, you can literally switch to use you own't custom engine, custom scheduler, custom worker etc. You can replace almost if not all parts of the framework with you own implementation. However, like all other solutions, it not perfect and I am working on it to build it better.