I will go on record as stating that I own and enjoy many Micro Seiki turntables and tonearms. However, you are trying to compare apples and oranges.
The Micro Seiki BL-51 was a very good midrange deck in the early 1980s - not the best product in their line but certainly far from the worst. The biggest problem is that the motor is not well isolated, the plinth is quite resonant by today's standards, and the platter is quite light and "ringy".
The CF-1 was a very well engineered tonearm, but like many Japanese arms of the time was designed for very lightweight, high-compliance cartridges which were then in vogue. Your Souundsmith Zephyr cartridge would be a good match, IF you ordered a high compliance version from Peter.
The VPI Traveler is a modern, well-engineered lower midrange system that is optimized for modern medium-compliance cartridges.
In my opinion, I would probably choose the BL-51 for style and the Traveler for sound quality. Frankly, I would substitute an MA-505 MkII tonearm for the CF-1. I think that would make the decks sound more similar.