SVG has no fixed pixel size until you rasterize it
An SVG describes shapes and paths rather than a fixed grid of pixels. The width setting is therefore the important decision here: the tool renders the SVG at that width and calculates the height from the original aspect ratio.
PNG and JPEG solve different problems
PNG is the safer choice for logos, UI graphics and transparency. JPEG is usually better for a finished opaque image when smaller photographic-style output matters. Converting to JPEG will place white behind transparent SVG areas.
Bigger output is not automatically better
A very large raster image takes more memory and produces a larger file. Choose a width close to the size you actually need on a page, slide or document instead of exporting at 8000 px “just in case”.
For example
For a vector logo that will appear about 600 px wide on a website, exporting a 1200 px PNG gives comfortable headroom for high-density displays without creating an unnecessarily huge image.