In this case I am making shelves out of 12mm (about 1/2 inch) baltic birch plywood with jatoba decorative strips on the front. If I make the jatoba strips 12mm x 12mm x length of shelf is it better to put the tongue on the plywood or on the front strip? There is one obvious difference: putting the grove into the jatoba leaves a thinner jatoba strip - but so what? Does it make a difference? and, if so, which way is better?