I wasn't hugely impressed[/url:m7qede8z] with either. I preferred the Pater to the Abt, but I usually do prefer the second-highest number of these sorts of beer ranges.
Mind you, I think the Westvletern beers are the most over-rated since Guinness. I think their rarity value gives them cred with raters far above what the taste warrants. Rochefort and Westmalle take some beating, IMO.