I cannot speak for everyone, only my own experience. I generally find the 10ft table to be easier for both games. But then my usual table is a Rasson Accura, Ox or Wolf with 4" corners.
I found (and still find) that my 10ball break took a lot of adjusting for me to figure out on the 10ft, takes longer to find it on the extended playing surface than on a 9ft, but besides that, the biggest issue is finding the speed of the table. Somedays I am right on the money, somedays it takes a few racks, or worse, you think you have it and totally F an important ball. My 9ball break works with little adjustment, but there is no box marked on the table and we break from the rail.