My guess is going to be pectinia because of the branching growth, unless the coral grew over a rock with a branching formation & if so I would say chalice.
Pectinia and echinata are different corals. Pectinia branches & encrusts (what you have here).
Echinata are just encrusters, they are in the same family as acans (acanthastrea) - though don't confuse this variety with acropora echinata (that's different).