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The major differences between 202 and 304 stainless steels are in the nickel and chromium contents. 202 has 16-18% chromium and 0.5-4.0% nickel, whilst 304 has 18-20% chromium and 8-10.5% nickel. There are other minor differences in the amount of carbon (0.08% in 304 and 0.12% in 202), manganese (2% in 304 and 5.5-7.5% in 202), as well as slight differences in the silicon, phosphorus and molybdenum contents. Both are austenitic steels and are essentially non-magnetic, but will become temporarily magnetic by working them. The manganese helps preserve the austenitic phase in the steels, as does the nickel. I can see an attraction in some people for using the 202 steel as it contains less nickel, and there is concern amongst some folk that they are sensitive to nickel.
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