Margerie Glacier is a 21 mi (34 km) long tidewater glacier in Glacier Bay, Alaska, United States within the boundaries of Glacier Bay National Park and Preserve. The glacier begins on the southern slopes of Mount Root, elevation 12,860 feet (3,920 m), on the Alaska–Canada border flowing southeast down the valley, then turning to the northeast toward its terminus in Tarr Inlet.
To conclude I think the Margerie glacier is the prettiest/best looking because the glacial ice appears blue from the absorption of red, orange, yellow and green wavelengths of light and, then, pools of meltwater on top of the glacier will appear bright blue.