Don't know anything about the twin tiger teeth nor have I wonder welded any teeth ever on my bucket (tried out a bucket with teeth and with my soil conditions I barely noticed any gains, however backdraging is "lost", something I use my loader for very often).
But basically the less teeth the better the digging force, as the same force is spread on less surface, however, it increases the chances of breaking a tooth or bending the bucket. Also less teeth will "scoop" less. (Compare a cutting edge scooping material vs 3 teeth vs 15, the contact area allows the scooping).
If it is softer soil, the number of teeth wont change anything as the bucket drives into the pile.
I think the ideal composition would be less teeth for more digging ability, or no teeth for most scooping/better level. The "more teeth" is simply a compromise between the two..
Just depends on what you want to use the bucket for.
Ian