Between the two listed... I would lean toward the Wilwood.
The Baer 6 series calipers weight a flippin ton... and they have had a few problems with the caliper concerning pad wear... along with some other issues. But even with the issues being corrected... the weight of the caliper alone would make me look elsewhere.
The Wilwoods on the other hand... are damn light. A 13 inch SL4 would do the deed to button up the rear.
My vote is for Wilwood. I haven't had any experience with baer but when shopping for brakes came around... I chose the wilwoods, I feel that you get more for your money with them. Not to mention I've had nothing but great customer service from them.
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67' El Camino: 468BBC, TH400, Grocery Getter