The lesser the sections the stronger the Rod, so a 2 piece is definitely better than a 6 piece no question. However you also have got to consider carting the rod.
Both these rods look, I would go for the Fladen, I like the way the guides are spaced and how it looks but having said that the Shakespeare is a proper saltwater rod and it will be more convenient to spin with, I recommend YOU go with the Shakespeare it also has saltwater Fuji guides, very important.
The Shakespeare SS573/SS576 look better than the Fladen, however please check WHERE it is Manufactured, do not go in for a reel manufactured in China, they are inherently problematic, irrespective of the Brand. Korean and Thai reels are good after Japanese, American and European manufactured reels.
Line wt is the recommended line weight in Breaking Strenght/Strain of the line you can use with that rod for optimum performance. It is only a guideline.
How large is large that is the question? Now I think that the Shakespeare Rod will handle larger and stronger fish than the Fladen, Remember, that a rod is not something you wrestle a fish, use it well.