I'll open with the caveat that, except for a few rides on SPDs and a short experiment with retro Campy SGRs, I've only ridden Looks or Look equivalents since I switched from clips and straps in the later 1980s.
A wider platform just makes more sense to me. The brand of that platform is negotiable but I want my feet on a "bigger" pedal. Go with the SL.
(Or Look, Campy, Time, Ritchey, Sampson and I'm sure there's others and that's not mentioning the generic Looks)
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“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay