Trees

Opinions will differ but PlantFactory trees get my vote. They are free to create for non-commercial use (such as in DLS Trainz layouts). SpeedTrees come in second but as they are now dated and require you to purchase a license to create them, it is a distant second.

For bushes and grasses some billboard creations still look good but most do not meet satisfactory standards, particularly if they lack LODs.

As to identifying specific trees, it would depend on the region you are modelling. I use Australian Eucalyptus species almost exclusively which would look out of place in any Nth American alpine settings.
 
I may stand corrected but to my knowledge PlantFactory trees do not sway in the wind, are not seasonal and ‘pop’ into and out of view quite badly in the latest version of Trainz+.

So for me, it’s SpeedTrees, despite them being more dated. I’m unaware of users having to purchase a license to use them.
 
I’m unaware of users having to purchase a license to use them
Not to use them but to create them.

SpeedTrees also suffer from the "popping" in and out of view due to LOD data. PlantFactory trees still need some "refining" in this regard as did the earliest versions of SpeedTrees.

PlantFactory Trees use imposters, which SpeedTrees do not. Imposters render the trees as flat 2D objects when placed in the distance. The 2D imposters always face the camera. N3V are now applying this technique, which is now used in several other games, to other scenery objects when they are placed in the far distance. The technique reduces the GPU rendering overheads.
 
are not seasonal

Not seasonal in Trainz Plus? I just have TRS22 PE (without the Plus subscription), and they do change color in fall and lose their leaves in winter.

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Shadows-of-the-leafless-trees.jpg
 
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