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From your question I fear that you may consider them of approximately equal value :(
TITLE is probably the single most valuable piece of real estate on you page. It has a high weight with Google, and is the first thing that the searcher gets to see about your page on the SERPs.
DESCRIPTION is perhaps a moderately useful tag, some search engines use it after the TITLE on the SERP.
META KEYWORDS are between very low value and totally useless, most search engines completely ignore them, if any uses them it is with low weight. There was an obituary for that tag on Search Engine Watch a few months ago.