I would argue that though autocracy is a strong contender for CV and quite doable...there is no way it is actually easier. The 75% is nice...but you'll never get it with everyone simultaneously like the other 2 ideolgies and when you're at war all open borders/etc. get cut off to your foes so your multiplier fall to nothing with the ppl you're fighting. I guess the idea though is you cripple them so it doesn't matter. That said, I bet it is way more fun to do it that way though. The peaceful way there is a bit too much sitting around for my tastes...I typically only attempt it if I'm bored and it comes up way before the science victory.
I think order could be a better bet on this one because order's iron curtain can really increase food or production that's traded between cities. Great people being born will have it easier to be born since production can increase with worker's faculty that allows for more buildings and more space for great works. Having a base with cultural buildings and wonders built can be useful.
Freedom unlocks the statue of Liberty which gives hammers per specialist, so if you take freedom to build the SoL then you switch to order before the other civilizations you could still get the 2 free social policies and take iron curtain.
You must be suffering from Ideological unhappiness to adopt a new ideology though so it might not work in most situations.
Yeah, well that's in case freedom fails.
If you were running a 4 city tall empire and you were first to choose and ideology.
Which would you favor? Order or Freedom? For a cultural victory?
Also, happiness is rarely a issue for me for some reason IDK.