Question Which Mouse do I buy?

They are each similar and have similar enough features. Honestly I would advise you to take a real close look at the image gallery on their websites to get a good idea of the button layout. Yes the layouts are similar but you will notice things like the Bloody ones are similar curved mice while the Interceptor is not curved like them. Also the side buttons vary from being smaller to larger...so depending on your hand size and experience with mice like this you may have a preference of what is easier to use (whether that means you plan on using the side or other buttons or you may accidentally click them when playing a game).

The button design and layout alone should be enough to give you an idea of what suits you better. If you are not sure, then look into other gaming mice and maybe try whichever one you mentioned that may suit your needs. That may help you figure out if you can adjust to that style or which layout and button size would work best for you.