15500ST grey dial or 26331ST blue dial?

[rotan]

My current collection consists of the Rolex Sub 114060 and AP Jumbo 15202ST. I’m looking to add another to my collection. As the title suggests, I will be put on waiting list and given the choice of either the grey dial 15500 or blue dial 26331. I love the simplicity of the 15500 and if given a chance, I would get the blue dial but unfortunately it is only reserved for their vip customers. Therefore the second choice would be the grey dial. I love how the dial shimmers under light. On the other hand, the 26331 with the blue dial is mesmerizing too. Can the watch lovers here give me advice on which watch to choose? Thanks.