Cocktails I wouldn't waste the more unique expressions. It's sort of just a smoke on/smoke off choice. The default cocktail mezcal for smoke is Vida from Del Maguey. You can certainly sip it, but I wouldn't choose it for that. Slightly smoky,
Fidencio Classico. For minimal smoke, more fruity agave profile, pick an Espadin (type of Agave) or an Ensemble (usually Espadin + something else). Bozal Ensemble would be a good very low smoke option. All three of those are widely available.
I dabble, but know some guys who do way more than that. Essentially you've got different types of agave, and you've got specific mezcaleros. Most of the brands, are bottling mezcal made by a specific person, from a type of agave (or more than one). Some of these agaves can give you very unique profiles, including green pepper, tropical fruits, flint/stone/clay, really a very very diverse spirit. I'm partial to some stuff from
Vago all the Espadin's are good, Ensemble en Barro is really good. This
Espadin from Koch is good, I just poured myself some as a reminder. Fidencio Classico is a good starter that you can sip or put in cocktails.
Note: don't sip these in a Glencairn. They really need an open top glass. They use copitas. I ordered a few handmade ones on Etsy. Some lady in Colorado makes them.