Mylar or white

So I'm building a stealth grow in a couple rubbermaid totes and was wondering what was better for walls. Mylar from emergency blankets or painting it white

Mylar definetly. The mylar emergency blankets reflect more light than white walls but they both are good

alot harder tho ^ lol

White walls are are easier to clean.

The mylar should be smooth/tight to the surface to get the max reflection.

I have mylar typed & glued to cardboard panels....but I also have a white wall, both work good

The proper flat white painted walls will reflect 85% of the available light.
Mylar safety blankets are folded and are very thin. They will tend to disperse the light in ineffective ways.
Mylar reflective material sold in grow shops in rolls (try to get the 2mil or thicker material) is far more effective for your goals.
The problem with Mylar is that it will degrade and needs to be replaced from time to time.
Overall the painted walls are the most cost effective way go! I have never seen Mylar in use in large scale grow ops. But for your small scale grow it could be a nice way to go as the roll will give you plenty of replacement material.
The choice is yours!

Mylar is alot more reflective then white. If you stick your hand between light source and wall of both white and mylar the side of hand facing wall gets a shady reflection from white but with mylar get a bright reflection.