I prefer Gerwalk mode arms out out of the three. My yammie V.2 1/60 VF-1J has been in Gerwalk for almost 2 years and I never get tired of displaying and flying it around like that.
After getting and messing around with the Yf-30,I find I like it most In Gerwalk. Probably because of the new waist joint, that gives it a ton of new posability options.