Neither are habitable from day one.
Neither Mars or Venus have a magnetosphere. If your traveler did nothing to the internals of the planet, they didn't create one either. That means two things;
1) Your terraformed planets will slowly but regularly lose atmosphere thanks to the solar wind - you've brought Venus' atmospheric pressure down to a little over 1% of it's current levels, and you've increased Mars' by 100x, but both are currently losing atmosphere at a steady rate to solar winds and this won't change; all you've really done is changed when the atmospheres are depleted.
2) You've left the big X-Ray machine called the Sun full access to anything on the surface. That means, your humans on Earth simply can't live there unprotected by some form of shielding or dome, no matter how temperate or oxygenated the environment may be.
Edit; *It should be noted that if there is an ionosphere on these new planets (and there would be) then at least some of the radiation would be deflected and I don't have exact numbers on me as to what percentage of the solar wind would be deflected in the process of stripping away the atmosphere and what would still reach the surface of the planets. The Aurorae would be spectacular and life as we know it would be impossible because of EM interference, but it's possible that the surfaces would be habitable to at least some degree, although I suspect still dangerous over the long term.*
It should also be noted that life doesn't just magically appear in complex form because the environment is right. It took over a billion years for life on earth to reach any reasonable level of complexity, and your planets haven't started yet. Also, there's no oceans (no net change to minerality) so with the lack of a magnetosphere especially you don't have an ideal environment on which it could form on either planet. Add to that the fact that you can't just plant trees on Mars and they'll grow; trees are just one part of a complex biome including soil bacteria and other life forms breaking down humus that if those things are not present, then your tree dies in short order.
The web of life on Earth is a amazingly complex and fragile and we often don't appreciate what we have in that regard. Just changing atmospheric pressures and temperatures does not a biome make and the worlds your traveler has made are no exception to that.
It might be a lot easier to colonise either planet, but that doesn't make either habitable.