With either of those fixtures you could keep most corals exept for SPS. You could probly keep some basic SPS like digitata. Metal halide is another route but requires some know how to get it done for a decent price. You could get one of these(
http://www.jlaquatics.com/phpstore/s...ct_ID=pfo-hp8m ) if you dont mind having lights hanging from your ceiling. that would cover you entire tank and let you keep any coral you liked.