NOC job code will be the main difference.
HCP: http://www.ontarioimmigration.ca/en/pnp/OI_PNP_EE_CAPITAL_WHO.html
ST: http://www.ontarioimmigration.ca/en/pnp/OI_PNPTRADES_WHO.html
See typically "Work experience" section to see the delta.
ST has CLB 5 language cut which is lower than the others.