If you want to run 200mm then either is good. The RC10R5 needs a little work to fit a 2s lipo. The serpent can accomodate a 2s lipo without modification. If you want to go the 1s route then either is good.
If you want to keep running 235mm then just run the L2. Put some dampertubes or side shocks on if you haven't already and it is as good as anything out there.