Sharpness of Delta 100 vs. Delta 400

I'm looking for a B&W film that I can make 20x24 prints that show a minimum amount of grain. The negative size is 645. Will Ilford Delta 400 give me similar results to Ilford Delta 100 or is there a highly perceivable difference (I'd like to use as fast a film as I can while maintaining small grain) ?

What ISO do you rate it at?

Thanks!

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