Ashland Chill 2.0 Insulated Stainless Steel Water Bottle vs 20oz TKWide with Café Cap, Tofu: which is safer?

Where these two actually differ

• We flag Bacterial growth in plastic cap seals on the Contigo and not on the Klean Kanteen.
• 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 Contigo.
• The Contigo is Stainless steel interior, plastic cap and insulation where the Klean Kanteen is Stainless steel bottle, stainless steel cap, which is most of the difference in these two grades.