Chinn's 34th Street. Fresh, simple, seasonal. I have never made it to Catch 35 because when it opened that made it possible to get into Chinn's easily - before Catch 35, there was an hour or more wait most of the time.
But the question is not so simple - what do you mean by best? Simple, very fresh and good. Or fancier stuff? Chinese prep, grilled, complex American? Most of these places have different approaches, so I would be hard-pressed to say one is better than the other.
Anyway, Chinn's gets my vote whether you include Pacific Blue or not. If you want a place to compare to Pacific Blue, go try out Fabulous Noodles' seafood offerings - not a joke, excellent seafood prepared Cantonese style including fish, clams, scallops, crab and more. It is what PB would be without the frou frou, and the prices are much better, too.
Can't say I have sampled Parker's, or if I have it was a very long time ago. Like I said, hard to get past Chinn's when I have a hankering for fresh seafood prepared simply.
Chinn's 34th Street Fishery
3011 W. Ogden Ave.
Lisle 60532-1608
630-637-1777
Fabulous Noodles
4663 Old Tavern Road
Lisle, IL 60532
630-305-8868
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Feeling (south) loopy