Steve Spagnuolo or Mike Sullivan: Who would be the better long-term head coach?

New York Giants ownership has already said that it will consider interim head coach Steve Spagnuolo for the permanent position at the end of the 2017 season. That would make Spagnuolo the obvious answer to this week’s SB Nation theme question — “who is the assistant coach on your team most likely to become a future head coach?”

The Giants chose Spagnuolo, the defensive coordinator, over offensive coordinator Mike Sullivan as the temporary replacement for the deposed Ben McAdoo.

Which of the two, though, would make the better long-term head coach?

The 57-year-old Spagnuolo was head coach of the St. Louis Rams from 2009-2011, compiling a poor 10-38 record. He has, however, had success with the Giants as a coordinator and is a popular figure in the organization.

Like Spagnuolo, the 50-year-old Sullivan is in his second tenure with the Giants. He spent eight seasons working in various capacities for Tom Coughlin, was offensive coordinator with the Tampa Bay Buccaneers for two years, and has now been back with the Giants for three seasons.

Sullivan has never been a head coach, but does have a long working relationship with Eli Manning.

If the Giants went with one of the two as the long-term replacement for McAdoo, which would you rather have?