Hold on now. Its not what you think.
To me, this work is not really about which type of government is the worst. That used to be my read of it.
I see this as being a statement on how far we can go with our technology and how those means may make us overshoot our end. Consider that any and all past governments had one check on their power, no matter how tyrannical they were they didn't have the means to completely enforce their will, which is part of why revolutions were even possible. The king's men were generally not omnipresent, records were not universally kept and accountability was hard to accomplish. A private citizen was more accountable to the village than to the king.
Orwell took what was then either modern technology or at least imaginable technology, telescreens (broadcast television was new), helicopters, language as a thought shaping tool, and microphones (I can only imagine how frightening the polygraph must have been). It was these things along relatively current political theory that enabled the regime of Big Brother. This was a story about how the tools mankind was always clambering to improve upon enabled us to do something terrifying, and considering when he wrote it, nobody could blame him, with Hiroshima having only been a few years earlier.
And that part remains true. With drones, satellites, databases, and technology like the Kinect, and the ability to access smartphone mics and camera's, the means for ever present government are ever more available. And with increasingly powerful and efficient weapons, trained combatants, riot gear, and a military that has been increasingly trained for urban warfare, lets face it, we couldn't rebel if we suddenly were to find ourselves under a regime we needed to rebel against.
The most frightening part is how far the regime is willing to go to achieve order, shaping and conditioning the very thoughts of it's citizens. It doesn't matter exactly how they do it, it matters that they somehow became willing to do it because if it is possible to do, we will eventually discover the means, and indeed we are already pretty good at conditioning, chemical mood altering, aggregate behavior (economics, sociology, marketing, public relations), mind reading (brain scan based controller, brain scan based lie detection that beats the polygraph). If Hitler or Stalin had access to these means, they certainly would have used them.