Egypt versus Gibraltar as Napoleon's strategic choice

Napoleon's army and fleet invite a counterfactual question: would reinforcing Spain and attacking Gibraltar have achieved more than the expedition to Egypt? His artillery background gives some grounds for imagining a successful attack, without making the outcome certain. Losing Gibraltar could have complicated British access to the Mediterranean during the remaining Revolutionary and Napoleonic wars. The proposed onward campaign toward India raises a separate difficulty: where would the ships come from to carry it there? Egypt's prestige is another possible explanation for the choice, left unresolved. The closing discussion prompt also offers Sicily and Naples as alternative Mediterranean targets for comparison.