It depends on lots of factors, but in terms of choreographing to the celeb without just trying to cover up their lack of ability by overdancing, or making them look stupid by giving them routines they can't cope with, Lilia for me is the stand out. She seems to manage to imbue her celebs with confidence, and tailors things brilliantly, often with little touches and high points in her routines that make them memorable. Anyone who could manage to get a passable AS and even a not entirely hideous Paso out of Dom Littlewood... the woman is a genius.
She is not my overall favourite pro, though I do like her a lot, and there are other pros whose choreo I have sometimes preferred (there are several of them out there who have done routines I loved, and plenty of routines which I've preferred over Lilia's equivalents); but her skill in choreographing for the purposes of SCD is IMO superlative.