27oz Wide Water Bottle with Loop Cap vs s Breakaway Wave: which is safer?

Where these two actually differ

• We flag Nickel leaching from stainless steel, Surface corrosion and pitting over time and Bacterial growth in cap seals on the Klean Kanteen and not on the Polar Bottle.
• We flag Bacterial growth in filter cartridge if unmaintained, Carbon filter efficacy degradation over time and Contamination of drinking water if filter housing cracks on the Polar Bottle and not on the Klean Kanteen.
• The Klean Kanteen is 18/8 stainless steel, no interior coating where the Polar Bottle is BPA-free plastic bottle with activated carbon filter cartridge, which is most of the difference in these two grades.
• These two are 5 points apart, close enough that price and fit should decide it rather than our grade.