To sum it up with my experience with my snakes, retics are hands down more work. I have to clean Caesar's cage once a month and he eats once every 10 days. He also used to push badly and hamburger faced himself a few times but i think this was mostly from wanting to breed as he has pretty much quit pushing now. Also from his ungodly feeding response, i have had to unhook his upper lip from one of his upper teeth when he bit his lip. That was NO fun at all and Caesar showed me unhappiness by wrapping around my waist and down my right leg twice.
The boas go 2-3 months between substrate changes and while they are friendly and interactive, they are not nearly as personal as the retic. Like i said, Caesar is the only snake who seems to actually want attention and usually when he gets rambunctious, i just slide open a door and he comes right up to me and sits there while i pet him. Sometimes he will also sit on my arm while i pet his body. Weirdo snake for sure. The boas can be a little unclear when trying to 'read' them sometimes but Caesar is easy to read. He clearly lets you know if he wants to be left alone but pushing your hand away or just crawling off.
I personally feel you cant go wrong with either one but if i had to pick a favorite, it would have to go to Caesar the retic as he is almost as much of a character as my bearded dragon. Those 2 really make my day when i see them. Almost like reptile dogs in a strange way lol.