Since you want to compete next year, finish the Silent first. It will be faster and easier, guaranteeing you are flying for next season. If you shoot for the moon and try to squeeze in a full build, Murphy (you've heard of him, right?) will often get in the way and you will be left watching at the first contest of the year... This way you can build the Hydeout and enjoy the experience instead of dreading it or being pressured to get through it with a contest date looming.
Doing the Silent first will also let you get practice time in for trimming that new plane and getting used to it's quirks before you have to fly it in battle.
Just my $0.02 (CND at that

)
Mark