Liquid-cooling is not really all that it promises to be in terms of silent computing. It's generally quieter than air-cooling only at the higher end where it's more efficient at "spot-cooling" specific components (like CPUs or CPUs) which would otherwise require more/bigger/faster/stronger fans to sustain intake of cool air, force it across huge heatsinks, then exhaust it out of chassis.
But liquid coolers still need almost the same number of fans on their rads, plus at least one or two for general chassis airflow (to cool motherboard, memory, drives, etc), plus they have a pump and gurgling blocks and tubes and reservoirs. Worse, the rads tend to be mounted on chassis locations which are "exposed" the most to the operator, where the noise produced from the fans is most audible.
All told, there's little question that liquid cooling (vs air cooling) has somewhat superior overall efficiency and definitely superior efficiency at the high end, so it's the "best" choice when you need maximum heat moved off your parts to achieve maximum (overclocked) performances. But there's little you can do to reduce actual noise output other than selecting a "quiet" PC chassis which dampens noise or simply throttling down all your fans when they're not actually needed.
I see that the main difference between the H110i GTX and H110i GT is the rad dimensions (along with the fan performance curve). Bigger rad means better cooling, more surface area and fin geometry to dissipate heat, even somewhat longer runtimes before cooling performance is diminished because all your liquid gets "saturated" with heat. If you're already willing to mod your stock AIO cooler then you can already do better than what the Corsair AIO kits provide - attach the biggest and best rad (and fans) you can to your existing H110i CPU block, whether it's made by Corsair or not.
Your particular system might have "better" (or at least quieter) cooling with a large air cooler. Not sure how much cooling you need or how "extreme" your performance/overclocking needs to be.
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