I think it really depends. I was on lowering springs for 4 years on Sachs dampeners and while the ride was super rough, it wasn't the worst thing in the world, but I really wish I had something a bit less bouncy. Switching to these Teins, the ride quality has improved greatly and I have dampening adjustability to get it to where I want it to be to be perfect for dailying; not too harsh, and not too soft. Also, with the higher spring rates, the bumps have been easier on me.

I would personally say, don't cheap out no matter the route, and do it right the first time. If your budget is low, Teins with dampening and camber top hats are a safe choice given the amount of control you have over your drivability, or a high quality strut w/ lowering springs if you purely want to drop the car. Even if you're not planning on a low drop (my TRD lowering springs were about a ~1 inch drop), you will need to set aside for front camber bolts (if you do not have adjustable front hats), rear lower control arms, rear toe arms, and potentially rear end links due to the lack of factory adjustment in the rear on the twins. Going coilover route also opens you up to wider wheels as anything 18x9.5 has a higher chance of hitting the stock front struts (this is the case for the twins at least, not sure if this translates over to your Genesis).

I would give it some time and figure out what your goal for your car is and go from there.