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One thing I’d think would be important is degree of mean reversion in the underlier. Equities don’t have much (so sticky delta more likely to be appropriate) whereas rates are more likely to mean revert (which would make sticky strike more relevant).
Equivalently, you can’t attach any meaning to an index price level so there is no reason for any particular strike to be important. But you can attach meaning to the level of rates, which makes vol more likely to stick to rates strikes.
Though in rates you dont have “one and done”. Ie regimes change and you end up with a sticky surface post “information” (say CB annoucement). While equities bring earnings/warnings etc. Which lost info value quickly.
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