Not really... tangent map are not so good in XSI... in fact, tangent map are calculated from normals and wings3d is not very good it... have only the usual normal, not the angle weighted one...
No one 3D software is perfect and each of them have strong and weak side... reason why i use various software for my models... several of them free and a few for money...
By example, for enough complex model, mainly capitalship, texture are 2048x2048... it is always best to work at the double resolution and sample down in the end... problem is that wings3D can only generate template of the UV to 2048x2048... so, for generate a 4096x4096 UV template, i use UV-Viewer ( free at http://d3d.sesseler.de/index.php?software=other&product=uv_viewer ) ... for calculate the angle weighted normal, i use meshlab ( free at http://meshlab.sourceforge.net/ )... meshlab is great for check and correct model too... a other software that i use for organic style ship ( with curve ) is UV layout pro ( not free http://www.uvlayout.com/ ) because it allow to reduce greatly strech problem...
Now that i think about it, you seek a texturer... before, there was a free 32 bit version of blacksmith3d paint ( not more free since the release of the 64 bits version )... was a really original way to texture... directly painting on the 3D model without worry about seam between piece on the UV map... for model based on something already existing like film, serie, anime, game... a few screenshots, 10 minutes with blacksmith3d paint and your model was textured... maybe the free version can be found somewhere on the internet...
Coming back to tangent map, until now, the best one are made with Cinema 4D ( far to be free software )... in the B5 mod, Cinema 4D is used by the mod leader for backing AO map in the usual cl map... process who creatly enhance the quality of the model texturing...
Point is there is a lot of software related to the 3D... each with default and quality... in the case of the free one, it is a good idea to try have them all... Wings3D is my primary tools for sins but the software have his own limits ( but have greatly improve in the last 2 years that i use it due to the several new version each year )
Hmm, somehow off topic... a guy ask somebody for make a model and all our replies are related to tools who can be used for make a model...