i voted tee-shirt because for me, it's easiest to tie in a knot at the nape of my neck. when i used a microfiber towel to plop i used to secure it with a hairtie.
i do still scrunch with the microfiber towel first, then plop in the tee-shirt. i found that using something separate for scrunching and plopping makes my hair dry faster because i'm not plopping into something that's already soaked.
It's nice to be important, but it's more important to be nice.