Have to disagree. The Bruins may be their biggest rival, doesn't mean a Leafs=Habs rivalry doesn't exist.
ri·val·ry
noun
- competition for the same objective or for superiority in the same field.
"commercial rivalry"
By that definition all pairs of teams are rivals. And let's face it we haven't been very close to superior in the modern era.
Here is the Leafs-Habs in the modern era:
1978 Semifinals: Canadiens, 4–0
1979 Quarterfinals: Canadiens, 4–0
Here is the Habs-Bruins in the modern era:
1968 Quarterfinals: Canadiens won, 4–0
1969 Semifinals: Canadiens won, 4–2
1971 Quarterfinals: Canadiens won, 4–3
1977 Stanley Cup Finals: Canadiens won, 4–0
1978 Stanley Cup Finals: Canadiens won, 4–2
1979 Semifinals: Canadiens won, 4–3
1984 Division Semifinals: Canadiens won, 3–0
1985 Division Semifinals: Canadiens won, 3–2
1986 Division Semifinals: Canadiens won, 3–0
1987 Division Semifinals: Canadiens won, 4–0
1988 Division Finals: Bruins won, 4–1
1989 Division Finals: Canadiens won, 4–1[
1990 Division Finals: Bruins won, 4–1
1991 Division Finals: Bruins won, 4–3
1992 Division Finals: Bruins won, 4–0
1994 Conference Quarterfinals: Bruins won, 4–3
2002 Conference Quarterfinals: Canadiens won, 4–2
2004 Conference Quarterfinals: Canadiens won, 4–3
2008 Conference Quarterfinals: Canadiens won, 4–3
2009 Conference Quarterfinals: Bruins won, 4–0
2011 Conference Quarterfinals: Bruins won, 4–3
2014 Second Round: Canadiens won, 4–3
QED