Choosing the right VPN goes deeper than finding someone trustworthy and privacy-focused -- you need a provider that can offer decent speeds too. VPNify can help you find the right one for you. The service tests multiple providers in locations around the world, and shows you the speed you'll get with each. It's like SpeedTest for VPNs.
VPNify walks you through how the service works when you first visit the site, but it's pretty easy. Just select the VPN you're thinking about signing up for from the sidebar on the left and choose the test location closest to you. Then click around on their server locations on the map to see where each provider operates exit servers. Click it to see that server's tested download and upload speeds. Click any of the buttons across the top of the screen to try another service -- email is listed by default, but there's also Facebook, Tumblr, Twitter, Reddit, Hacker News, Pocket and others.
With just a few clicks, you can try out different providers virtually, test the sites you visit most often for solid performance, and see which VPN is best for you based on where you live and what you do. Of course, you should make sure your VPN is trustworthy as well, but VPNify can help you do your homework before paying for a subscription you might regret.