umm honestly im not sure, i think they all kinda exaggerate their claims so none of them are gonna give you like ultra filtering or anything like a filter you'd get installed into your kitchen but i have the steel brita water bottle and i love it. i believe the pitchers mold easily and obviously they aren't portable so i prefer the bottle, you do have to buy the filters for it but i just get a box of 6 that will last a year bc you're supposed to replace them every 2 months. as long as you clean it often and let it fully dry it's great and i think it helps me drink tap water without worrying too much and without having a ton of plastic waste although it's not strong enough to get out like BPAs (which is in everything now) but it's better than drinking water from a plastic bottle that bound to be worse