Of these four, assertion of parsimony is chosen by many contemporary cladists. Unfortunately, such definite answers may well be wrong. Suspension of judgment is usually a sound choice, but deeply unsatisfying. Molecular sequences are becoming increasingly important in phylogenetic inference, and they have distinct properties. The logic of phylogenetic inference is identical for molecular and morphological characters.
Molecular characters are available in vast numbers.
Every amino acid in every protein is a character. Similarly, every base-pair in every gene is a character. There are only possible four character states for a DNA base-pair. There are only 20 possible character states for an amino acid. With such low numbers, convergence and reversal become reasonably probable.