The "tuner" lugs from what I know actually insert the key into the center of the lug itself. So those are also "open", but are limited by the depth of the wheel lug hole AND the length of the hub studs. If the studs are too long, and the wheel lug hole is pretty deep, then you'll end up not being able to snug the lug nut up to the wheel securely. This happened to me once with a "tuner" style lug nut.
However, with any spline style, there's no such issue. At least, I haven't had any issues with spline styles in terms of "limiting factors" as long as you get open-center ones.
Just make sure you get quality lugs and/or keys. There are plenty spline style lug kits made in Asia, and the keys are really weak/brittle. If a lug happens to be overtightened, the key will shear off when you try to break loose the lug(s). Not a very pleasant thing to happen
