Smaller adult size and they are less arboreal. They will climb though. Both are amazing snakes and pretty easy keepers. I have been into the more active nature and faster metabolism of colubrid snakes recently. My partner got a leucistic Texas ratsnake in August and she is great. Ate within 2 days of bringing her home and never refused a meal. She had a little attitude at first but is honestly as docile as a cornsnake now.