I completely disagree with this.
You must avoid a choice that lets you be happy and "slightly more wrong", if that choice ultimately deviates from the truth.
Always pursue truth first. It is knowing the truth that often leads to fulfilment, even if it may not lead to immediate happiness. because with truth can now grasp at the problem and find a way to fix it. Ignorant bliss is only a temporary salve, and cuts short the route to true fulfilment.
Always opt for truth no matter how sad/bad it makes you feel. Emotions are fleeting; the truth isn't, and knowing the truth is what gives you more control over your emotions.