The time has almost come :)

[metalcopper]

I love Burms, they are so mellow and easy to work with, in my experiences. I have both snakes you are talking about, and for me, my Carpet is still nippy and flighty. He uses his entire enclosure, sits in both hides, and is often out for display, but is not real easy to handle right now, but I really enjoy him. My Burm is always calm and slow and easy to handle. Large Burms require more than one person to safely handle, but I find them to be just as mellow as young ones.
Burms are my favorite, so I would recommend that first, if everything is as you say it is for space and help, but Carpets are very enjoyable too; it depends on what you are looking for to get out of your snake.