Declarative Programming Options

Section	Feature	Publisher Actions	Workflows	Process Builder	Flows	Headless Flows	Triggers
Defaults	Formulas in Default Values	Simple formulas
	Default Lookup values	Must be selected
	Pass values in from URL
Building	Decisions			Limited
Using	Form Entry	Standard or VF			Ugly		Visualforce
Mobile	Works on Mobile		NA	NA		NA
Availability	Available in Group Edition
Modularity	Can call Publisher Actions	NA
	Can call Flows
	Can call Headless Flows		pilot without PB enabled			Probably
	Can post to Chatter			Limited	(takes work)	(takes work)

See this similar in a chart from Salesforce's Trailhead module. See Choosing the Right Automation Tool blog post by Button Click Admin for links.