Are AirTite Coin Holders ideal for storing any type of coin? or are the cardboard rectangles better? Cardboard rectangles:http://www.coinsupplystore.com/site/1648271/pics/all2x2.jpg AirTite Coin Holders:http://www.coinsupplystore.com/site/1648271/page/785916#Ring (examples along sides od writing) not my products or coins