Both heavy, slow and a bit dated, though I had a sailing buddy with the Valiant 44(?) that impressed me with its workmanship. Being a semi-custom boat, the interior
was "distinctive" in its layout, but well put together.
Both have a very pretty profile, if you value traditional styling.
The huge knock
is the early Uniflite-built Valiant's use of a fire retardant resin that resulted in the terminal osmosis
of many hulls. This ultimately resulted in the bankruptcy of the company.
Passport 40 impressed me as an Asian boat (with all the pluses and minuses), particularly belowdecks, whereas the Valiant seemed somehow more familiar. I did once test sail the 40 before purchasing
a Wauquiez 40 that better met my needs. I don't recall
any untoward characteristics during the sea trial.
Clearly, any of these boats should have a very serious survey
. In the end choose the one that rings your bell, though I wouldn't dismiss the advantages of newer design, perhaps again by Mr. Perry.
Good luck with your search.