The image should be self explanitory... the Delta trike is well known for being more tippy... draw a line from the outside rear wheel to the front wheel and look at the short distance between the line and the CoM. Now look at the stabalizing outside front wheel of the Tadpole.
Now add the location of the center of gravity above the ground... and you will see that most tadpoles have a much lower center of gravity. Yes indeed, most Tadpole Trikes handle much better in corners.
Most tadpoles dump it on slow-speed powerful accelerating turns where delta's dump it on turn-stops.
And steve, you are close. Some recent measurements have shown distribution somewhere between 50/50 front to rear to about 60% front and 40% rear. This is very rider dependent.
And as for traction, Deltas, if they have a differential, do not have limited slip differentials... if one wheel breaks traction, all power stops to the other wheel. Traction on both Deltas and Tadpoles are more dependent on tire tread than anything else. And most avid trikers like smooth tires to minimize rolling resistance. No matter what style bike or trike, smooth tires will slip in gravel, mud, sand, wet leaves, etc... If you plan on needing traction, use a more aggressive tread pattern and lower tire pressures.
A simple test ride on both will tell a lot. Both have their plusses but for performance, Tadpoles can't be beat... for easy dismounting and a lower bottom bracket, Delta's are for you.
And let's not even get into braking perforamnce
