What are the advantages and disadvantages of both? Is one better than the other? If one was building and flying his first DF model, what method would be best suited for that indivdual? Field is no a problem, several to choose from with length being no problem. This question pertains to the BVM Viper and BVM Aggressor. The majority of the Vipers I've seen use flaperons and the Aggressors I've seen have separate controls for each functions. I guess if you read into my questions, I'm siding particular to BVM jets BUT understanding and learning how to use both functions are just as important as chossing which model to fly and build. Hope I haven't confuse anyone - thanks, Steve