Rotten eggs = horrible awful smell “eggy farts” = horrible smell, sometimes labelled the same as rotten eggs Uncooked egg, e.g just cracked open = doesn’t smell of anything a nicely hard/medium boiled egg = nice “buttery” smell any egg cooked with butter or oil [e.g omelette, fried or scrambled] = Very nice combination of smells, half smells of whatever you cooked it in, half smells like the buttery smell of a boiled egg.

As for taste, yeah. It is largely dependent on whether you cooked them properly though. I also really like picking up on the taste of egg in a cake.