Full Idea
For some the notion of a disposition is contrasted with the notion of an occurrence; for others, it is contrasted with that of a categorical property.
Clarification
'Categorical' is the opposite of 'hypothetical'
Gist of Idea
Dispositions can be contrasted either with occurrences, or with categorical properties
Source
Stephen Mumford (Dispositions [1998], 01.6)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.20
A Reaction
I vote for dispositions over the other two, but I take the categorical properties to be the main rival.