Sigils: Command vs Statement?

[schluchter]

Hello. I have a question that I can't seem to find addressed anywhere.

What is the comparative performance between a sigil derived from a statement of intent (the generally preferred method), and one derived from a command statement?

That is, has anyone found better results from a sigil formed from a condensed statement, such as "I will learn to speak Cantonese," or one from a command, such as "Learn to speak Cantonese"?