I have tried numerous pdf readers for android including kindle, beam, ezpdf, foxit, etc and most of them suck. Almost all of them are nearly unusable for large, high rez pdf's. Many don't support all PDF formats or features. Acrobat can handle a wide range of pdf's but is dog slow. The funny thing is, acrobat on PC is really inefficient too but PCs have so much horsepower that it doesn't matter. On weak mobile devices, it's unbearable.
By far the best pdf reader for android is Mantano Ebook Reader. It's the fastest AND has the best, most useful features like autocropping. For ipad, Good Reader is the best..