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R, (削除) 31 (削除ここまで) 29 bytes

function(a,b)pmax(a,b)+a*!a-b

pmax takes the parallel maximum of the two (or more) arrays (recycling the shorter as needed).

I was looking at Luis Mendo's comment and obviously I realized the approach could work for R as well. That got me to 30 bytes, but then I started playing around with different ways of getting indices instead to improve my original answer, and stumbled upon !a-b as TRUE where a==b and FALSE otherwise, equivalent to a==b. However, for whatever reason, R doesn't require parentheses around !a-b as it does for a==b, which saved me two bytes.

Try it online! (new version)

Try it online! (original)