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I'd say Index is more popular as a light novel series (over 10 million copies sold, beating the sales of Haruhi, Shana, Kino no Tabi, Zero no Tsukaima, etc.) but Railgun has done better as an anime/manga. Index's detailed storyline fits a light novel format better where it isn't limited like it is in an anime/manga form, and Railguns's simpler story fits an anime/manga better because there's much less happening, thus why the sales for Index's LN's and Railgun's anime/manga have done better respectively.
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