The Hunters model of Samus has been the best so far.
And I thought the reason why Samus' look has changed was obvious. It's because of Zero Mission. The Japanese designs take priority over the Retro Studio designs.
On the other hand, the Samus seen in Hunters is a mix between the more realistic Samus in Prime with the anime-type created for Zero Mission.
You also have to take into account that Retro isn't very good at creating human character models... If there is going to be a comparison of Samus' look, it should include the model's of Samus we've seen throughout the entirity of the series, not just the 3D ones.