The verb mood that would work best for stating your opinion is Indicative since it is used to communicate real information through full sentences.
The indicative mood conveys factual information, it is used for statements.
The imperative mood is used to make a strong request or to give a command.
The subjunctive mood has more varied uses, among which we have doubts, wishes, requests, demands or proposals.
The conditional mood makes a proposition that depends on a condition, generally opposite.