Reticulated can get extremely long, and the record for the longest one was 32 or 33 feet long I think. These snakes can max a good 30 feet long, but I normally see them when they are in the mid to high 20s (25-28 feet). Burmese do not get as long as they do, maybe to a max of 20 feet long or more (correct me if I'm wrong, I don't normally research the big snakes too much) so if you wanted one in that range I would say the Burmese would be your best shot. If you haven't researched this snake much, I really recommend to do so. I also will recommend purchasing a baby first, and raise it up. They do get pretty long within their first few years too. There are some people on here with Burms so if you wanted to ask questions you can ask one of them because they are experienced with caring for Burms.