What's Best , Audio Research VT-100 or VT-100 MKII

I have heard that alot of people like the sound of the VT-100 better than the up-dated VT-100 MKII. What do you think? I,m using a Classic 60 with a LS-25 now. I also have a D-70 MKII with a LS-16 that I like quite well.