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Read every text you can get your hands on. There is NO definitive text when it comes to orchestration.

One is not better than the other. They're both different. The Forsyth, while slightly outdated, goes nicely into depth with a lot of obscure stuff with instruments that most books don't, especially if you're into musical instrument history. Also, the Forsyth is a much less "dull" read than the Piston with its sarcasm. The Piston's advantage is the actual "orchestration" part of the book which is far more broken down into its funadamental elements than the Forsyth. In fact, I'd say the Piston is all about "Instrumentation" and then "orchestration". Forsyth's strategy is more "orchestration" within "instrumentation" However, remember to study scores; a text is only step 1. Step 2 - 346 are score study. And step 347 is to actually write stuff.