2-1-1 was designed for TvZ, and it is arguably not a good choice for TvP and TvT. This post discusses how 2-1-1 can be adapted and used in each match up.
Cloak Banshee is a common tech choice for TvP 1-1-1 variations in the last two months. It diverges from other mainstream options and provides a unique twist to the early and mid game.
It seems that there is a “resurgence” of mass Widow Mine drop in TvP recently. The build could be a good option for the standard 1-1-1 paradigm in the metagame.