I'd expect the restore time to generally be longer; if restoring to a new database, potentially significantly longer.
For a backup, SQL only needs to backup the active portion of the log. When restoring, SQL needs to restore the entire log, and also ultimately roll forward and/or roll back in-flight transactions to make the final db useable.
SQL DBA,SQL Server MVP('07, '08, '09)
Prosecutor James Blackburn, in closing argument in the "Fatal Vision" murders trial: "If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them."