VPI HW-19 or VPI Traveler

You haven't given a lot of information about the HW-19, including the platter that's on it.   You say it is in new condition.  The only thing that really matters is the bearing.  It needs to be inspected.  Given the age of the unit, it is likely to need a new ball and thrust plate to be in "new condition."

If it is really in new condition it's the one I would buy.  If its price + restoring the bearing to new condition is less (or maybe even a bit more)  than the new Traveler it would be my choice.

Just one person's opinion.

Bearings wear out.  You have to take the bearing apart, remove the bottom with the thrust plate, wipe everything clean, and have a look.

Not doing that is like buying a good looking used car without lifting the hood.

And there’s no odometer.

But, hey, it’s your money!

Regarding the bearings. It will probably play reasonably well if the owner took care of it by changing the bearing oil, generally every 5 years or so.

The original question related to "new condition." If you want to assure that the table is playing at its very best you can eventually take the bearing apart and look at it. The ball and/or the thrust plate will or will not show signs of wear. They are easily replaced. [Actually if there’s a flat spot on the ball it can be removed, turned, and re-glued in.] At the VPI forum people will tell you how to do it yourself. Or VPI will do it for you. Consult with them as to their charge.

In any event, as others have noted, the potential of the HW-19 is certainly greater than the Traveler.

Lithium grease has been used on the inverted bearing,  I don't recall seeing it recommended for the non-inverted bearing.  

Mobil 1 is fine.  I have also used the synthetic variety of Slick 50.

Upon the recommendation of the tech who repaired my TNT bearing I now use a much thicker oil.