Form follows function. As the bicycle frame represents a finely honed trade between strength and weight, between stability and maneuverability, the bottle cage represents a compromise between strength and weight, between accessibility of beverage and safety of beverage.
I’ve tried fancy bottles, holders, and combinations of both, and I keep coming back to the classic bent wire bottle cage. Works with a wide range of containers, from actual water bottles to 20 ounce soda bottles out of the grocer’s cooler. In a pinch, you can roll up a shirt and a change of pants into a nice, tight cylinder and be set up to be seen in public.
But, sometimes, the option in place just works. When that happens, it’s time to jump on the bandwagon that works and ride it until the wheels fall off.