personally i prefere more rectangular tin, since they are easyer to pack ( for me ). and i dont like the ficked hinged lid, since they reduse the uses of a tn. i prefere either non hinged lids or removeble hinged lids.
but i like the fact that they are made of nickel silver or brass, since that doesnt rust. and nickel silver is quite shiny so usefull as a improvised signal mirror....