I cannot decide.
What are the pros and cons or each?
Go for a 125cm, they're on sale currently at mistresslovedolls.com
which is a sister site to this one. Only the regular flesh tone is on "closeout", the tan will run you extra.
To me the smaller ones are more like a toy than a real girl (unless sh'es really petite!) and the holes are maybe not as deep, especially the mouth. Weight is also a factor. 125cm can be almost twice as heavy as 100cm, and storing your doll is more difficult with the larger ones if space is an issue. For me, I like the 125cm body with one of the cuter 100cm heads.
Depends on the weight. And what you are looking for one hole or all three holes. The higher the centimeters the more it will weigh and more difficult to have fun with. Also smaller CM sizes will require smaller children size clothing.