If you use proxies you'll know how important it is to find a fast server to use. This video shows you two options, using free proxies which you can harvest using the tool in this video.
Or the software subscription which gives you access to an international network of fast proxies and VPN servers.
Which is best depends on your circumstances and requirements. Free proxies have an obvious benefit but will be very slow or supported by adware. If you need a fast proxy and one that is secure then you'll need to check out paid services like the one in this video.
The reality is that everyone's requirements are different. If you want to access specific sites to watch TV, films and stream media then you'll need speed, which you won't find for free as they're costly to run. Having said that the best paid proxies are well run, fast and relatively inexpensive.
But maybe you need proxies for another reason, perhaps to search or post links. Many Internet marketers or SEO professionals need to adopt multiple identities every day to post, search and promote.
These people will typically need a large variety of proxies spread across different IP ranges - speed will not necessarily be as much of an issue. What is an issue is being able to switch servers quickly and seamlessly particularly when using automated tools.