Do any of you use the automated cat litter boxes?? I have found 3 different models I need advice as to which one seems to be better??????

Also wondering do any of you think that scoopable litter is (Less Dusty than the clay disposible litter?) I am drawing a blank when it comes to Chloes hair falling out it doesn't seem to be getting any better. So the litter change is going to be my next step. Only thing I can think of is.... I wonder if she is rolling on the litter and it makes her skin itch???? Just a guess???? Other than that I can't think of anything else the vet said she looks like she is in perfect health. Vital signs are good personality is good eating well so the only thing I can think of is that she is having an allergy to the clay litter. She just loves rolling in it?????? Thank you so much for any advice in advance. -Heidi-