I don't see why Imperius is worse.
In my opinion it's the fact of direct force which can compel someone to do something they absolutely would not have otherwise done. Confundus is confusion.
Not being aware that one is acting on suggestion of another rather than one's own initiative is probably harder to recognize and therefore harder to counter.
I don't think we have any evidence whether Confundus is easier or harder to resist. Harry doesn't experience it from the inside, does he? (His resistance to Imperius is picked out as unusual.)
In my opinion it's the fact of direct force which can compel someone to do something they absolutely would not have otherwise done. Confundus is confusion.
Not being aware that one is acting on suggestion of another rather than one's own initiative is probably harder to recognize and therefore harder to counter.
I don't think we have any evidence whether Confundus is easier or harder to resist. Harry doesn't experience it from the inside, does he? (His resistance to Imperius is picked out as unusual.)