[Sony Smartwatch 3] ReiverBlade:
pretty much that, Wifi is not low energy compatible like BT4.0, in the end BT4.0 is optimal (near 0 energy consumption Wifi is only starting to show up tho but no device use it now )

what's the advantage you see with Wifi instead of BT? i wonder because i see none.

funny because peoples in that thread claim Wifi use less battery than BT4.0, that's just so weird because it's wrong ... i suspect a Placebo effect.

"Power Consumption: A General Picture

Bluetooth devices typically have low power consumption while Wi-Fi uses much more electrical power. In part, this is due to the broadcast range of the two technologies. Both Bluetooth and Wi-Fi devices announce themselves by emitting a signal with a frequency of 2.4 gigahertz. Bluetooth devices emit a signal that travels for about 30 feet, while Wi-Fi signals travel about ten times as far. Wi-Fi devices need more power to generate a stronger signal.

Power Consumption: Details

Rahul Balani of the Electrical Engineering Department at the University of California, Los Angeles, has run extensive tests to measure the power consumption of Bluetooth versus Wi-Fi. His results indicate that in some cases, Bluetooth uses less than 3 percent of the power required by Wi-Fi for the same tasks. For example, sending data at the rate of 75 bytes per second over Wi-Fi requires approximately 80 milliwatts of electrical power. Sending data at the same rate over Bluetooth consumes only 2 milliwatts. "

for basis

and for Wifi direct

"Power Consumption

Since both specifications are touted as “low energy” and expected to help fuel innovation in the always on society we live in, power consumption is important. I’d argue that it could be the most important aspect which determines the winner. Until current mobile battery technology improves, we can’t be expected to utilize anything that significantly depletes the life of a battery.

Wi-Fi Direct is said to extend battery life by anywhere from 15 to 40 percent depending on factors such as file size, Wi-Fi protocol, range and device type.

Bluetooth 4.0 has the more impressive of the two technologies as Bluetooth Low Energy (Bluetooth LE) is said to allow a battery to run for a year or more before it’s fully depleted. That said, additional factors within your device will contribute to battery drain, so this may not be fully accurate, but it’s impressive nonetheless.

A number of cool technologies currently make use of Bluetooth LE. One of these is TrackR, which is a small coin-sized device that attaches to just about anything and lets you track the item using TrackR’s Distance Indicator in order to find it. Lost keys, missing sunglasses, or that hard-to-find wallet or purse might just be a thing of the past.

Other technologies, like Knock, aim to eliminate the need for passwords by allowing you to unlock your devices only when your mobile phone is nearby. Once installed, the iOS app allows Mac users to tap twice in order to log in to securely log in to a password-protected computer.

Winner: Bluetooth 4.0"

as a example, my SW50 last 2-3 days (more often 2d than 3) with my use (notification, calc, schedule, and some MyRoll pics showoff for fun ) i use Minimal&Elegant watchface (highly customizable and customized), while my Wiko Highway Star 4G last 3 to 4 days permanently hooked on BT with the watch (depending the use i get 1-2 day sometime but 4 was my maximum)