AQ-4105 Showerhead Filter System with Handheld Wand vs Mist 5-Mode High Pressure Filtered Shower Head: which is safer?

Where these two actually differ

• We flag Bacterial growth in filter cartridge, KDF-55 copper-zinc alloy shedding and Activated carbon dust or particles on the Aquasana and not on the Showerhead Filter.
• We flag ABS plastic thermal degradation, Bacterial/fungal growth in filter media, Brass/copper leaching (if brass internals used) and Filter media particulate shedding on the Showerhead Filter and not on the Aquasana.
• The Aquasana is Polypropylene showerhead body, activated carbon/KDF-55 filter media where the Showerhead Filter is ABS plastic head, stainless steel or brass internals, activated carbon filter media, 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.