句構：不定式與分詞詞組的分別（目的vs因果）

昨日在討論區問了如下問題：

In response to the long-term measures recommended by the School Board, the then Principal initiated the Pledge Day on “Clean LA", to encourage all schools to make the “Clean LA” commitment on that day.

I wonder if it sounds better to replace the to-infinitive clause with a participle clause:

In response to the long-term measures recommended by the School Board, the then Principal initiated the Pledge Day on “Clean LA", encouraging all schools to make the “Clean LA” commitment on that day.

because I think it is seldom to use to-infinitive clauses after a comma.

我覺得個答案幾好。原來to-infinitive詞組與分詞詞組，有一點點微秒的分別。