The way I've always tried to think about it is this:
Chimay - the most consistent, the biggest and somewhat bland (very relatively speaking here in terms of Trappists). I know exactly what I am going to get every time I crack one. Note that when I say "bland" I typically mean a suppression of some of the characteristic esters and phenols from the Belgian yeasts.
I love them. Here I am sipping a Premiere:
Westmalle - very, very consistent as well on account of being the second largest after Chimay. The Dubbel is incredible with a fair bit of age on it. The Tripel speaks for itself. I enjoy the 750 ml bottles.
Rochefort - very tough to classify with any certainty. There seems to be a consistent characteristic phenolic character that I don't enjoy all that much. It's been stated that fast fermentation is the cause but I can't say for sure. Rochefort seems to be the least consistent of the "big 3" (Westmalle, Chimay, Rochefort) but is the most glorious when presented with a prime example. As much as I enjoy Westmalle, a prime Rochefort 8 is the most incredible of all the Trappist beers.
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