It makes absolutely no difference. Web browsers do not look at the file's resolution. They only look at the total number of pixels. The resolution information is discarded; the image is shown on the screen at the resolution of the computer monitor, no matter what the resolution of the file is.
If you have an image that is 300 pixels by 200 pixels at 72 pixels per inch, an image that is 300 pixels by 200 pixels at 96 pixels per inch, and an image that is 300 pixels by 200 pixels at 3,000,000 pixels per inch, all three images will look identical on a Web browser. The Web browser does not even look at the image's resolution at all.