All four applies for TWR - actually... π
Although some perhaps will start arguing about "Fast render times", I'd say; it all depends on your scene/model, the materials used, lightning, wether you're using one of the biased or unbiased presets and - of course - how fast your computer is... π
Others may debate the "Low cost" and we need to acknowledge that although 99,00 USD is a low price to many, the price is high for many people in other parts of the world...
My statement is, that compared to other render applications, all of the above points applies for TWR... π
So... It's impossible to say exactly which one to leave out from the list, since it will depend on the individual person...
If I personally had to leave out one, it would be "Fast render times"...
To me it's also a little fuzzy... Fast... Compared to what...??
To me it's fast, to others it's Acceptable, while others again may find it slow...