cost being the same there would be no sane person telling you they would prefer lowering springs over a decent set of coilovers. go read the suspension guide thread, there is decent info in a few posts there, as well as the BC Coilovers/KW V2 coilover thread
What are you planning on doing with the car? If you plan on track your car i'd say go coilovers but if you just want to drop your car then springs are good, but if i were you i'd say go MScoilovers. thats what i'm getting.
Buy coilovers if you want to spend the money for coilovers or if you want to actually use your car at the track. If you're lowering for appearance only then springs are a cheaper and perfectly good alternative.
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