What the recipe says → what it actually means → what to pour.
Gold rum
Supposed to mean lightly aged – but that gold can be caramel coloring as easily as time in a barrel. In a classic, it almost always means a dry, aged Spanish/Cuban style.
Reach for a lightly-aged dry Cuban style, unless the recipe names a specific island.
A few good bottles Don Q Añejo · Ron Matusalem · Cruzan · Angostura
White · Light · Dry rum
Nine times out of ten, a dry Cuban style: clean and not sweet. There are also aged-then-color-stripped whites with real depth – less “authentic,” but authenticity can go to hell if the drink is better for it.
Reach for a crisp dry white; or a stripped-aged white when you want more body.
A few good bottles Bacardi · Don Q · Denizen White. Planteray (ex-Plantation) 3 Star is a gorgeous blended white too – just know it leans rounder than bone-dry, so read the drink.
Dark rum
“Black” isn’t a color a barrel makes – it’s caramel, and often a little sugar too. Myers’s Dark and Cruzan Blackstrap wear it on their sleeve: sweeter, rounder, clearly enhanced. That’s no knock – in a drink built to carry sweetness, that lush molasses body is exactly what you want.
Reach for one of these when the drink can take the sugar and you want deep, dark weight behind it.
A few good bottles Myers’s Dark · Cruzan Blackstrap · Goslings Black Seal
Jamaican rum
Distinct and characterful, often called for by name – but “Jamaican” doesn’t automatically mean funk-forward. Appleton and Coruba are solid, dependable pours that play well in almost anything. “Aged Jamaican” usually points right here.
Reach for one of these for a well-behaved Jamaican backbone that won’t hijack the drink.
A few good bottles Appleton · Coruba
Jamaican funk
The hogo – high-ester, pot-still funk that announces itself from across the room. When a recipe wants that wild, overripe-fruit-and-diesel character, nothing tame will do, and nothing else stands in.
Reach for a high-ester Jamaican – and don’t be shy; a little funk carries a long way.
A few good bottles Planteray OFTD · Smith & Cross · Rum Fire or Wray & Nephew for it raw
Demerara rum
Hard to go wrong – these days it all flows from one place, the Diamond Distillery in Guyana. Named for the river valley (and its unique cane), not an island; Guyana sits on mainland South America. Dark, caramel weight.
Reach for a Demerara for weight and backbone; the 151 version for a float or a lift.
A few good bottles El Dorado (most available stateside) · Lemon Hart 151
Martinique Rhum · agricole
AOC-controlled like Cognac – made from fresh cane juice instead of molasses, so it’s grassy, bright, and unmistakable. Distribution is spotty; if your shop has a bottle, thank your lucky stars and grab two.
Reach for an agricole whenever the recipe names it – there is no real substitute.
A few good bottles Rhum J.M · Clément · La Favorite – whatever your shop carries
151 · Overproof
Less a flavor than a lever – high-proof rum for a float, a fire, or to push a big drink over the top. A little goes a long way. Steer well clear of the odd orangey generic 151, though – that stuff is the definition of rotgut.
Reach for a Demerara 151 for weight; use it with a light hand.
A few good bottles Lemon Hart 151 · Hamilton 151
Spiced rum an opinion
From a cinnamon-vanilla-allspice junkie who loves rum: most spiced rum is still an artificially-flavored vanilla bomb – fine for a rum & Coke in a red Solo cup, wrong for a real drink. But the category has come up. Don Q’s spiced is a genuinely nice one, and any small distiller building real, dry spices into the distillation or the barrel – not dumped-in flavoring – is worth a look.
Reach for a well-made craft spiced rum – or, in doubt, a clean rum plus a real cinnamon syrup so you steer the spice yourself.
A few good bottles Don Q Spiced · small-batch distillers using real dry spices
Red rum the aside
I’m as confused as you are. There was a “Red Rum” in the late ’90s that tasted like suntan lotion. If a recipe calls for it, use a smooth, lightly-aged island rum.
A few good bottles Mount Gay · Angostura · any Barbados distillery