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IMO, the best choice would depend on the buyer's druthers.
Would you druther have a steel receiver (Remington), or one of aluminum alloy (BPS) ?
Would you druther have/like the RH side-ejection Remington (NG for lefties) or the bottom-ejection BPS (good for both RH & LH shooters) ?
Would you druther have a wide availability of an extra bbl (Rem) or less options in your future (Browning) ?
Would you druther have nice wood (Browning), or plainer (Rem) ?
(Both, of course are available synthetically-stocked)
Brownings definitely have a shinier finish (bling ?) than the Remington's - but earlier Remington 870 Wingmaster's (which can be found in "as-new" condition) also have a very fine finish.
Finely polished/bluesd steel (Rem), however, will not be as shiny as polished/anodized aluminum (BPS).
I would never, however, spring for a Remington Express - which looks IMHO like unfinished business, or an expendable tool.
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