Hey y’all - - instead of following in the footsteps of others, how ‘bout trying each type of applicator and making your own choice based on the results that you get?
Gather up the following: two each terry, foam, and microfiber applicators, two MF towels, your favorite wax, your favorite polish, an obsession light (200W-300W handheld work light), and your wife’s (girl friend’s, neighbor’s) black car. Pick a test area on the car an closely inspect the surface for micro-marring from various angles using the obsession light, then apply each product using moderate pressure and each type of applicator. Wipe off the products and re-inspect the test areas with the obsession light. All of this sounds like a lot of trouble, but it will take less than 45 minutes and when finished you’ll know which applicator best suits your needs..
I’ve done the above comparing and here’s what I’ve found: When applying wax/sealant or very mild polish (P21S GEPC or Meg’s #7) foam introduces a fair amount of swirls, terry causes somewhat fewer swirls, and microfiber little or no swirls. When using a harsher polish (Meg’s #2, etc.) a pad gives a more even pressure than a cloth and foam increases the cutting power. For working on individual scratches in a small area cotton balls introduce no swirls, use minimal products, and are inexpensive. YMMV!