6P is a good option but I go with K just because it's faster than 6P. 6P isn't bad though and I do 6P depending on the situation. Mainly when I have my opponent pinned to the wall and I'll use 6P4 which gets me in unshu stance and I can either grab or do another unshu setup such as 1KP4 and again I can either grab or just do a wall splat with K during unshu stance or P+K during unshu.