The 9688 was developed to address flow issues on cold starts for the GDI egines in Hyundai, Kia and Genesis'. They would spike over 200psi in "cold" conditions (based on my conversations with Hyundai techs, it seems to be below 0°C). Which was too high a pressure for many aftermarket filters. Aftermarket manufacturers addressed this by increasing flow, can construction, ADBV, increasing the bypass valve pressure release and the threading to reduce blow out. That being said, I do not have issues with the Champion COS3593A that I use on two Beta II Hyundai engines, a 2014 Theta and the new Kona Nu Atkinson is actually quieter on start up with the Fram Ultra over the 35504. The construction on most, not all, but most aftermarket 3593A oil filters have addressed the issues that Hyundai said were issues. To completely address the issue that Hyundai/Kia said were failures, most aftermarket manufacturers simply created a new filter with the same qualities already addressed in the 3593A/4459 with the 9688 filter making it closer in size and construction to the 35503/35504/35505. Moral of the story: use the COS3593A with confidence and if you have an increase in start up chatter from the timing chain or a tick/piston slap, change the oil filter to an OEM and see if that resolves (this is the exact TSB that Hyundai uses for determining engine ticks). My Beta II and Theta engines thrive on the Champion COS3593A and are getting better filtration over stock (99% @20 microns over 97% @ 30 microns).
EDIT: in addition, the Champion COS3593A is actually a high-flow filter with twice the inlet hole surface area over the Hyundai 35504/35505 and most 9688 variants. Combined with the continuous louvered outlet design, it makes for a very rigid and ultra-high flowing oil filter. I won't link it, but if you do a youtube search for the COS3593A you will find a recent video (June/July 2020) of the exact filter cut open and analysed.
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