Which domino is heavier?
Neither, both have a weight of 7.

Domino weight values are determined by counting the pips on bound sides. Heavier tiles left unplayed in hand, will earn your opponents more points in many Domino variants.


  The sum of the two values, i.e. the total number of pips, may be referred to as the rank or weight of a tile, and a tile with more pips may be called heavier than a lighter tile with fewer pips.