Buy nice or buy twice is what I usually say. But I got swayed by a supposedly good deal on KSport coilovers when it was time to replace the 9yr stock struta on my car. I ended up selling it at half of what I got it for after only 2 weeks… I charged that loss to experience.
Thankfully I managed to get a good deal on a set of Tein Flex Z when a local shop had a ptomotion. Enough to offset my loss on the KSport coilovers.
It’s not even worth comparing the two brands. In the end, you do get what you pay for. My only gripe is that the Tein’s don’t come with camber plates which is not a big deal for me, the ride quality makes up for it.