Looking into expanding into another Legacy deck - 4c Leovold vs. Bant Deathblade

I currently have a Grixis Delver deck fully built and ready to go. While I enjoy playing Delver, I am hoping to build into another deck both for variety's sake as well as to expand my collection. Assuming that budget or money isn't an issue here, which deck would you say is the better deck at the moment? I remember people saying before that Bant Deathblade had a very high win rate, but is 4c Leovold the better deck in the current format? Its metagame share would indicate that, but popularity doesn't always equal power level.

Any input would be appreciated.