All based on your personal preference. Personally, out of the TH creams I've tried, 1805 is the best for me. There are samples on the T/H website if you're curious.
Trafalgar has a much stronger and more distinct scent - a real love it or hate it scent. Grafton is strong and distinct to a much smaller degree and everyone tends to like it somewhat (except me as my skin reacts to it). 1805 is a clean oceanic scent with a little more classic influence than american oceanic scents.
I prefer Trafalgar. Grafton seems like it has some citrus scent to me and I don't like citrus. The Trafalgar is complex and masculine; it is my weekend cream. Larry