The Polar bottles keep drinks cold on 90F-100F days better than competing brands I've used. If I fill a pre-chilled bottle with ice and cold liquid, the mix will stay cool for ~90 to 120 minutes in very hot conditions. The caps tighten on the bottle securely, and the valves allow you to squirt/sip drinks in the open position without leaking and without fussing with a twist-mechanism (just pull and push like any normal bottle). The understated bottle designs and colors are a nice aesthetic touch, too.
People give me the Podium chill for gifts. I try them, then went back to my old Polar. Now with the new mouthpiece the choice is even clearer. Podium Chill mouthpieces are much bulkier (even the new one) and simply take more effort than needed. The new Polar mouthpiece is small and, very easy to use; just put it in the mouth and squeeze. No need to turn a dial when flying down a hill when you can sneak a drink yet don't want to fumble with turning the mouthpiece. Moreover, the exterior of the bottles make noise in my carbon bottle cages. Granted, the cages i use grab the bottle tightly, but the Polar makes no noise (other than some ice slosh, not a bad thing). They also look better than the PChill.