Personally I’d trust Kiwior to offer us more this year (between availability and his level of talent) versus Tomiyasu (higher talent, but a full crock).
Regardless, the left back position seems a conundrum with an untested Timber, a crock in Tomi, Zinny with his warts, and a readily available mediocre Kiwior.
Just need to bring back Tierney to fully embrace the chaos.