Each snake has its own personality but I find the more the snake is handled and the bigger the snake physically is, the more tolerant they are, but thats not going to hold true for many snakes, just a very general thing to say.
honestly I would see a rack system being better, they have a safe place to stay at then, they can come out of their comfort zone, then go back to a safe place. opposed to being in an open aquarium, then being taken out, and back into an open aquarium.
all my snakes besides the big ones are in rack systems, I have snakes that are awesome when their out and some that just want to hide. I don't think the rack system has much effect on it, more how much I handle the snake. then i have some that don't get handled hardly ever and still don't care. each snake is different.