I have PC101 from Sony and I rather use that as a tape deck when transfering DV footage to NLE so that my PD150 won't wear out. Is there a difference in quality when I transfer using PC101 or PD150? I also own TRV900.

Thank you.

No there will be no difference in quality. Its all code digital ones and zeros basically.
I use a PC-110 as a transfer deck instead of my VX2000 as well with no problems.