I have had Mako shark. I understand it is rated the best tasting. I thought it was very good. A local beach brew pub used to serve it but I think some activists may have pressured them to stop serving it.
It is good tasting but also thresher is very good tasting.
If you get fresh mako steaks don't eat it the same night it is caught , wait a day or 2 before cooking it , as it gives the mako steak a chance to relax.
I have also eaten white shark steaks but prefer mako steaks to the white shark steaks. -Tom