I have singlets from most of the more prominent running companies (Nike, Saucony, Asics, NB etc.). So far, I have found the Nike Fast Dri-Fit to be my favorite by a pretty considerable margin. I would like to give the Aeroswift a try. However, I find they run quite short and I am 6'4" with a fairly long torso, so it doesn't work for me.
What is your favorite/go-to singlet, particularly for racing?
If money is not the determining factor, then the Soar racing vests are the very best in the game at this point in time. Their Graphene singlet is better than anything I have ever put on, and I've been running for 46 years. Even their regular race bests are interesting, different aesthetics, and gorgeous materials.
Are the aeroswifts good? Yes, no question, and the current adizero vests (new colors just dropped) are probably second to the Soar vests. I do find the Adizeros to be very broadly cut across the body while the Soar vests are cut closer to the body (my preference). you can order and return if you wish, but I don't know if there is anything better than those on the market.