Halliday & Matthiessen (2014: 609):
A key difference between clause complexing and cohesive conjunction is that while the clause complexing specifies(i) the nature of the logico-semantic relation,
(ii) the degree of interdependency, and
(iii) the clausal domains being related through the formation of univariate structure,
cohesive conjunction only specifies (i) – the nature of the logical-semantic relation.