I think the difference lies in where one's policy takes shape. Triangulation, I think, tries to find a workable tandem between two separate points of view. President Bush is more likely to find a conservative solution that'll pass--as conservative as possible, sometimes...as in the flawed Education bill or the Campaign Finance Reform bill.
I think both have MAJOR problems, some practical other Constitutional--but the fact remains, the President did have some victory here, and took away from the liberals a campaign issue.