I don't know what the intensity of the 32 / ft lights are or the 18 / ft ones. I'm wondering both vendors if would share the wattage of the lights with you.
The lower density looks like better craftsmenship and they seem to have more experience based on the number of pics they have. The guys from Earmark tend to provide good value on this forum, so for that reason they get my vote. If you have a problem, I think you'll get better support too.
Finally, brighter isn't always better, too much light makes it hard to drive at night. Would be great if you can only turn on the tower speaker lights.