に対して・にとって: the difference
に対してN3
Meaning
In contrast to, While, In regard to, Whereas
Past papers
Tested 6 times in past papers
Example
彼はみんなに対して優しい人なんです。
He is kind towards everyone.
にとってN3
Meaning
For, To
Past papers
Tested 6 times in past papers
Example
それは会社にとってもいいアイデアですね。
That is also a great idea for the company.
How to tell them apart
「にとって」 is followed by an evaluation (important to him), never by an action or attitude. 「に対して」 is followed by an action or attitude directed at someone: 「先生に対して礼儀正しい」 (polite toward the teacher). 「にとって」 is wrong here.
Before a noun: 「にとっての＋N」, 「に対する＋N」, 「に関する＋N」. These matter a lot in sentence-ordering questions.