Blake from UP here. There's merit to both of these opinions. Both Spring rate and dampener tune contribute vastly to ride quality, height, and other factors. However, the lower a car is, the stiffer the spring rate needs to be to prevent riding the bump stops. So inherently, larger bumps may become more pronounced with any of our springs. The more minor road imperfections are smoothed, but significant gaps, potholes, etc., are accentuated.
Coil-overs are built from the ground up to complement one another, with 30-way adjustable dampening to match your ride height preference. They have a significantly higher cost than a spring swap, but we find many customers return within a year to make the leap. As a DIY guy myself, I say spend the money once on Coil-overs. Rather than twice for springs and then Coil-overs.
That being said, we don't expect to have inventory on springs for at least two months once backorder is filled; coil-overs have about 3 to 4 months' lead on them. DM me if you're looking for more info.
