The 67 series is basically a larger version of the Printmaker 35. It's a single column enlarger that'll handle up to 6x7cm negs. The 23C series is a twin girder enlarger, and is considered a step up from the 67 series. There are a wider variety of accessories, and it'll handle up to 6x9cm negs.
Which is better in real life probably depends on condition, and what accessories come with them.