After trying out Gen3 I have to give a negative answer to this question, Gen3 is simply the better attempt to create a full-fledged tree generator for Blender since now and the one with the most complete (and complex) GUI, full stop. And it can only keep improving week by week.
Gen3 is parameter-driven tree model generator for Blender. Generation algorithm is based on model described in "Creation and Rendering of Realistic Trees" by Jason Weber and Joseph Penn.
Being a parameter-driven generator, the script developed by Stager13 gives a good amount of control over the generation process and by playing with all the parameters it supplies a wide range of results can be achieved.
The latest version (0.3) boasts some interesting features:
- UV generation for trunk and branches
- Leaves generation
- Import paramenters from Arbaro's xml files
Unfortunately there are still some issues to be fixed (the generation process can be slow and cannot be calcelled, the GUI requires the user to know some technical details [i.e. it is a little too complex for the average user], no pruning and lobes support, branches/leaves aren't automatically joined to the trunk [it's the same behaviour found in L-System]) but the script is still in an early stage of development, so let's hope the developer will keep up with the good work done since now.