Im going to be different and go with a Blood. Having a few may make me biased. A carpet is a cool snake but for me Im only drawn to the GTP and ETB as pets. I still need to get a ETB.
As for the Bloods they are great snake but I don't think it is fair to compare them to a BP. They are more like a pet rock...they never move. They most certainly need to be handled young to make them manageable as adults. Mine were very nippy when they were new and made me bleed a lot.
I can pick mine up just like my other snake and even if they are not fully supported they don't freak out. Its hard to support a 5.5ft 30lb snake 100% of the time when moving it where you need it. She is surprisingly strong and can shock you with their speed when they want to move. Overall they are great snakes if you can handle their size and strength but they are not much of a display snake. Well that may not be true. My big girl wears her cat litter hide as a hide so she is always kinda on display.
Like I always suggest for Bloods anybody thinking of getting one should really try to get their hands on a adult so they can see for themselves the actual size and strength of them. They are no joke and can make most snakes seem pretty puny.