Insulated bottles are heavier and can typically hold less water, given similar exterior dimensions, compared to their non-insulated counterparts. But the advantage is that they are vacuum-sealed to better maintain the temperature of the liquid inside for far longer periods of time.
For hiking and outdoor climbing trips, I prefer non-insulated bottles. There’s slightly less weight to lug around, and my main concern isn’t having cold water but rather having enough water. Around the house, the office, and the gym, I grab the insulated bottles. I don’t have to worry about their smaller capacity, because there’s always a faucet around. It’s nice to pour fridge-temperature water into a bottle at night, sip on it until I go to bed, then leave it out and still have cool water in the morning.
