Depends how heavy you feed them, if its a male or female, the percents and I was told genes too like tiger is from mainland so tigers tend to get larger even SDs. Also depends how much they push and overall are food driven.
Caesar was driven for food as a 5 month old baby and pushed bad enough to put a couple scrapes on his chin. He has since mellowed on food and I try and give him a medium rat every 10 days but at his peak, he was eating large rats and did pound down a 250g large rat with ease.
Caesar is a male 37.5% SD, 31.5% dwarf and 31% mainland white tiger het snow. He just turned 10 month old and is just over 5'. He seems to be gaining bulk now so not sure how long until he gains more length if he does. Kris at Vital Exotics told me he should top out around 5-7' but I'm planning for 10' just incase.
Key is buy from a reputable breeder who is not fudging on the percents lol. Kris isn't doing retics this year as he is focusing on his bison farm so Vital Exotics is out for now. I would go with Daniel Solis or Shannon Roepke for SD stuff. Bob Clark is good too but I'm not sure if he keeps percents on his SD stuff. Plus you will pay for his name on the animal unless you catch a sweet auction like JM did.
Personally my 2 favorites are boas and retics. I was always a boa guy and I always wanted a retic but was kind of intimdated by full size mainlands plus when I was a kid, retics had a reputation as being fairly ornery and mean. But Caesar is awesome except when he pissed on my bare foot or when he goes spazz mode on me and climbs all over me or wraps around my leg as he heads for the floor lol.