The vibra probe is water proof. The tiny tech is not water proof.
The tiny tech is not so tiny either, but it will fit into (and fill) your back pocket. The vibra probe is smaller.
The tiny tech has a light which comes on with the push of a button. The vibra probe don't light-up. And I can't remember ever using the light on mine - I have a hard-time finding muddy coins in the sun. I pinpoint the coin with the probe, but I still often need to feel around for the coin.
The tiny tech (and I think this is true of the vibra probe too) can be left on all the time. When the probe is pointing up, it goes into a power-saver mode of sorts. When you point it downward, it's on and ready to pinpoint.