Dennis / others - the one posted originally by Dennis is a superior design over the original "transom saver" that mounts to the trailer.
Transom savers that go from the lower unit to the trailer are not saving much - you hit a bump - yes, the trailer springs will bounce and take a lot of the jolt - but your motor is tied to the trailer, and that jolt it transfered from the trailer to the lower unit, stressing your motor and transom.
However, the new design locks the motor down into the bracket, and also helps keeps the motor from turning side to side. The bouncing of your engine now on the transom is greatly reduced, as it has stabilized the entire package.
For the physics thing - I've never taken physics, so I could be wrong, but I'm pretty certain that if you look at a small, tightly packaged "beefy"
"triangle", compared to one with longer, thinner "legs"... the small, compact one will win out in strength. Think about it.
You will probably get more stress on a transom by jumping 1 foot waves than using this design of transom saver. I'm not trying to get into a arguement about which is best, but if you buy one of these, I am about 99.9% sure you will never buy the old style again.
All the best,
Glenn