One of these days, I'll do a big soldering-iron round-up, everything from the big American Beauty 100 and 75W irons though the nice Hakko and Weller midsize irons down to the tiniest.
One of the very smallest irons in my toolbox, I haven't found since I moved: Wahl used to make a corded, variable-temperature miniature iron that I count among the finest ever built. I purchased a similar Far Eastern iron some years ago at the Dayton Hamvention, only to discover it doesn't get hot enough to actually solder with.
I needed a replacement miniature iron. The Radio Society of Great Britain talks up Antex brand irons in their Handbook and they do look good; I've found RSGB to be an impartial reviewer, and when I realized the Antex G/3U 18W miniature iron (that may be an older model number but you can still buy 'em over here) listed on Amazon and elsewhere, I decided to find out for myself.I used it to build a Vectronics audio filter kit.* It worked very well. I was concerned that the tips slid on a little too loosely; but it gets plenty hot, plenty fast, and the tip stays in place. Like the Wahl, tips go over the heating element rather than inside. It's claimed to enable better heat transfer; it certainly makes for less iron in the way of the work.
The one shown here has a chisel tip, about 1/16" wide. The kit was through-hole ICs, with 0.10" being the closest spacing and there was no need for anything smaller.
The grip stays cool and the assembly is a good size and balance. It does require a heavy stand, as it weighs so little that if it's not securely held, the cord can drag it around! The Hako stand shown here is not a good choice -- the kind that surrounds the iron with a coiled spring-looking holder would be best. But that's my only complaint. G/3U is a good iron for small work. They're listing for just over $28, last I checked.
* Which shipped with the wrong value resistors for one of the critical frequency-determining positions, 2X for three filter sections. Off by a factor of 10. Oops! But the right resistors are a dime apiece, and that gets fancy 2% metal-film types, so it's not a big deal.