IMO *most* training will be beneficial to you in one way or another.
As far as "tech skills", that would depend on what your definition of those skills is I guess. If you mean using heavy doubles, decopression planning and diving, mixed gas diving, then no, I would not think that would be a benefit to you, especially in light of the cost of that type of training.
Nitrox, advanced nitrox and any type of rescue training on the other hand, would have a direct bearing on recreational diving.
Tek training, in most cases, also involves purchase of quite expensive toys, err...I mean equipment, that would have little if any benefit to purely rec diving.
It would be easier to answer your question if you listed a specific class you wanted to know about.
MD