What tense is better tu use?

I am working with you today or I will work with you today.
layla1234I am working with you today
This one is better.

Both are correct.

If you're going to work with him for sure, use the present progressive. Yet, you can use both of them here.

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The core meaning of each sentence is essentially the same. Will - generally produces a stronger tone.
 CalifJim's reply was promoted to an answer.
Both are fine. However, since you're sure you're going to work with him today and it's the immediate future,
you'd better use the present progressive form.

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