Grand Hyatt Dubai and Centric Dubai serve totally different purposes, in my opinion.
GH is for families and children. Centric is for couples or singles. Didn't yet see a guest above the age of 50 here, or anyone below 18.
GH is in Dubai Creek, which is wrong direction if you want to be in the fancy spots (Downtown, La Mer, Jumeirah, Marina, The Palm). Centric has a good location for the fancy spots (as has the Andaz). You need Uber, though (if you like quality, if not then you can also use Taxi).
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In my opinion, the pool and beach of the Centric are both not a viable option for pool or beach lovers. Don't got to the Centric for beach or pool, you would regret this.
We are going to beach clubs instead (Drift, Summersalt, Cove, etc.) or go to the new Aura Skypool.

Bye