Which ever one looks to be in the best condition, and offers the most accessories in the deal. Both are similar, maybe if one has a longer column, I would go for that, unless you arent going to print anything larger than 11x14. Talk them both down, and keep one in storage for back-up and extra parts. Then, of course, you can always buy my B-66 Pro Lab, and have a condensor head and a dichro head with some other needed items. Sorry, I had to plug one of my machines.