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Jalapeño vs Chipotle

The short answer

One fruit at two points in its life. A chipotle is a jalapeño left to ripen red and then smoked for days — grassy and green becomes smoky and raisin-sweet, and the two are not substitutes in either direction.

Side by side

Jalapeño and Chipotle compared side by side
 JalapeñoChipotle
Botanical identityCapsicum annuum L.Capsicum annuum L.
Part usedfruitfruit
OriginMexico, and specifically Veracruz — the name comes from Xalapa, the state capital.Mexico, where smoking is the traditional answer to a chilli too thick-walled to sun-dry. The technique is documented well before European contact.
Flavour notesgreen, vegetal, grassy, moderately hot, juicysmoky, sweet, dried fruit, tobacco, moderately hot
Heat2500–8000 SHU (typically 5000 SHU)2500–10000 SHU (typically 6000 SHU)
FlavourGrassy and vegetal with a clean, moderate heat that arrives quickly and fades. The thick flesh gives it substance — a jalapeño is something you bite, not merely a source of heat.Smoky and sweet with a raisin-like depth, and a heat that arrives behind the smoke rather than in front of it. Meco is markedly smokier and less fruity than morita, which is the distinction worth knowing when buying.
AromaFresh, green and vegetal, with a bright capsicum smell and none of the dried-fruit character of an aged chilli.Wood smoke over dried fruit — tobacco, raisin and a little chocolate. None of the green freshness of the fresh chilli survives.

Which should you buy?

Jalapeño

Buy fresh, and treat pickled as a separate ingredient rather than a convenience version. Neither is a substitute for chipotle, and reaching for chipotle when a recipe wants fresh jalapeño swaps a green vegetal note for a smoky dried-fruit one — a bigger change than the shared name suggests.

Chipotle

Buy whole pods. Chipotle is one of the clearest cases for it: the smoke phenolics that define the spice are volatile and go first from the ground form, and a whole pod can be soaked and blended into a sauce in a way powder cannot. Ground chipotle is convenient for rubs and is a reasonable second jar, not a first one.

Full detail on jalapeño and chipotle, including evidence grades and sources for every claim above.