All,
Thank you for all your input. My question was not intended to question the quality of any of the various figures. My eyes being what they are, the Woodland figures are easier for me to place on the layout. However, I was struck by the level of detail and excellent paint job on the Arttista figures, which is why I purchased them. I was just disappointed that there was a noticeable size difference when put side by side.
As a follow-up, I went to the Arttista site and was able to post the question to them, and hopefully I will get an answer as to scale sometime this week. I initially posted the question to the forum hoping someone would have the definitive answer this weekend.
If Woodland and Arttista both state that they are 'O' scale, then I would think, as others have stated, that it is the 1/43 'O' scale versus 1/48 'O' scale. The other possibility could be that the Woodland figures are 'meatier' having thicker arms, legs, etc, while the Arttista are closer to actual human body dimensions.
BTW, I was able to use the figures in a separate scene in a boxcar - one of those little 'hidden' scenes that I always tell visitors to look for. So all is well in the land of little people and big trains:>)
KC