There are simply no general statements possible, I have visited regularly for several years, using probably a dozen VPN services over time. Some work better, some not at all - and the only reliable information is that it changes all the time.
If there is some political event going on in Beijing, chances are it'll be harder than usual anywhere in the country. If you depend on VPN connection in China, I recommend having at least a couple of the "good" ones available, PP is one of them for me.
Anecdotally, I can give a nice example of the VPN lottery in China right now - last night after 6pm the *only* thing I got working - both on mobile and landline DSL - was PP with Obfuscation through Hongkong. Nothing else would even connect, including a usually reliable competitor service. Today, everything works again like I described above, ¯\_(ツ)_/¯