It's not even close.
Mike Walker far worse, in every conceivable measure - length of stay, losses, had us bottom of the table & stranded, never won anything with anyone else, basically a total charlatan.
Smith was a perfectly acceptable bottom half of the table manager who played tedious football but strangled the life out of expectations at the club, to the point we became 'relegation threatened Everton'. The myth that Moyes & his media cronies peddled about how Moyes rescued us from relegation battling, as if that was all we'd known, instead of the truth that it had only been 4 years of bog average fare under Smith (and 1 bad year under Kendall 3).