My first 2lbs of TSS were 9.5, all that was available when I bought it, shot them until I ran out, killed every bird I shot at and one at around 48 yards.
I switched to 9s hoping I would get less shot hung up in the meat.
No numbers for you as far as patterns but it shot well but I didn't notice anything drastically different than straight 9s.
There are around 54 more pellets in the 9.5.