I’ve not branched too far out in the toast department, but what I’ve found so far is that each has its own place. HDT is very delicate and subtle with a bit of leather… but can sometimes be a bit too subtle, and I have to focus in order to detect the fragrance at all. Easily the “classiest” of those I’ve tried, particularly in the grind.
Irish No. 22 comes full force with less complexity and feels more obviously food-like: pastries, breads, graham crackers. I like to use this one to unwind and treat myself, lol.
SG Irish D (not D Lite) is perhaps even stronger and simpler in scent than the No. 22, to my nose. But the scent itself is very clean, creamy, and light – for some reason it makes me think of sweet wood shavings. This one is my general purpose toast, and I never seem to get tired of it.