As the Lifestyle Director at Women's Health, I've tested everything from mattresses to winter coats to Apple Watch bands to, now, water bottles. Basically, if it's a product that can help you live a healthier lifestyle, I've probably tried it. And considering proper hydration is an essential part of living a healthy lifestyle, the right water bottle can ensure you're hitting your daily hydration goals.

Enter: The Stanley Quencher H2.0 FlowState™ Tumbler (40 oz) and the Hydro Flask 40 oz Travel Tumbler. These two are the veritable "It Girls" of water bottle culture, so of course, I had to know if they lived up to the hype. I've spent several weeks putting both water bottles to test, assessing everything from insulation ability to leakproof potential to straw comfortability (a must for me!). Here are my honest thoughts about each water bottle—including, most importantly, which one deserves the coveted title I just made up of "HBIC Of Hydration."

More colorways and size options than Hydro Flask

Holds a full 40 oz with the lid on

More ways to drink from Stanley lid than Hydro Flask lid

Rigid plastic straw is less comfortable to sip from than Hydro Flask straw