From a flavor standpoint, I love that the two of them get together and unite all peoples via the connection of +1/+1 counters
Cynthia's Gible 102/182 Loading
Uro, Titan of Natures Wrath Uro, Titan of Nature's Wrath draws multiple cards over the course of the game, accelerates you on lands, and even gains you some life
He briefly played in the Dialga-VStar Turbo mode in the metagame as a dynamic and explosive way of accelerating metallic energies to deal damage twice in the same turn with his VStar power, but it was a double-edged sword as could hit the fastest possible combo or freeze in some moments, not gaining enough strength in the Standard format, however, in the Expanded format, it is a destruction machine for having Pokmon that more accurately accelerate the acceleration of energy than it need even turn 1 or turn 2 to develop your game
I think this makes it a much better investment and its also great if you have something like opposing-themed decks that play really well against each other, or if you carry a back-up deck around