20oz TKWide with Café Cap, Tofu vs Stainless Steel Tumbler w/ Slide Lock Lid: which is safer?

Where these two actually differ

• We flag Powder-coat cap degradation over time, Bacterial biofilm in cap threads and seals and Thermal stress on seals at extreme temperatures on the Klean Kanteen and not on the Thermos.
• We flag Plastic lid degradation and Bacterial/mold growth in lid mechanism on the Thermos and not on the Klean Kanteen.
• The Klean Kanteen is Stainless steel bottle, stainless steel cap where the Thermos is Stainless steel tumbler with plastic slide lock lid, which is most of the difference in these two grades.