Light bulb LED equivalent of a CFL (Compact Fluorescent Lamp)
As @SolarMike said, you can't compare the actual power consumption of the bulbs nor can you rely on the manufacturer's claims of "Equivalent to xx watts". If you only care about brightness, and not color, then compare the number of lumens provided by each bulb.

No, you cannot determine (exact) brightness by looking at actual power consumption, and voltage is completely irrelevant. Two bulbs that consume the same amount of power at the same supply voltage may provide different levels of "brightness".