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The 10th Edition is basically a condensed version of the Big Book. If you don't have BB, it is better to get that instead of the 10th edition.
I have not been through the 10th Edition but I believe that the sort of questions in both books remain more or less the same, if not the same questions being repeated.
BB Math is indeed simpler, so you might want to look at other sources like ETS Math Review, Nova GRE or even Barron's for that.
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