The TunnelBear free just like Hotspot Shield gives you limited data. In the case of TunnelBear, you get 500MB free per month. ThisVPN's free version is therefore only good for light gamers.
Also, TunnelBear is not router-compatible making it not to be a good choice for mobile users.
In terms of security, it also has military-grade AES 256-bit encryption, Ghost Bear mode to prevent ISP throttling.