What are the similarities between megaladon and great white sharks?

Their
teeth are triangular. They both appear to both be very large. Unfortunately, all we have are the teeth of Megalodon. So, all else is speculation. They may have been seen by man, but, we do not know for certain as no one has discovered an unfossillized tooth of a Meg.

Ken, the Shark Wrangler, www.sharkwrangler.com