isn't there more than 1 type of sustec coilovers? regardless... I would be inclined to pick Tanabe's lower end suspension over Tein's lower end models from what I've seen... Both had good customer service when I talked to them... but vendors with experience with both brands told me tanabe's models generally were better valved, and it's true that some of the teins had not so great valving...keep in mind this is comparing both tanabe's and tein's lower end models though, when it comes down to it, unless you're competitive in some sort of racing I doubt it would make a difference to you, just pick whichever you want.