These are my impressions based on a not-very-critical tasting of small samples, probably 1/2-3/4 oz each, and in informal rating based on my experience with them so far. (yes Capn I know these ratings are top heavy but these are most of my very favorite rums

Zacapa XO - excellent, not overly sweet like the 23 yr, very complex and rich, maybe the best I have yet had. 9.5
Zacapa 23 - still on the sweet side but quite nice. 8
Zaya 12 - really sweet and liqueur like. IMO a step below the other Z's. 7.5
Flor de Cana - this is one I like but not as much as others seem to. Though it has many rich and complex flavors, they all seem to be very similar "dark" flavors - smoke, tobacco, leather, wood. Drier and less fruity than my favorites. 8
Myers's Legend. Rich, dry, chest warming, woody. 9
Gosling's Old Family reserve. Rich and woody but more fruity and sweet than the legend. 9.5
El Dorado 15 - one of my favorites. Near perfect. 9
El Dorado 12 - my other favorite. A little sweeter than the 15, with some cola-like flavor. back and forth which I like better, but given the price I drink a lot more 12 yr. 9
Note that though I gave the highest ratings to the Zacapa XO and Gosling's, I don't consider them my favorites when I figure price into it. I can't afford to drink them often.