We did the Manta Sunset party cruise and 100% recommend it!!
We did not do the snorkel Manta but agree with what others are saying about it because of what we heard from others at the El Coz.
You cannot beat the crew from the El Coz Dive Shop which runs the Manta! They want you to have a great time so you will recommend them and they deliver.
We met another couple that was snookered into taking the Fury and they felt like they overpaid and was disappointed and wished they had done the Manta instead.
. Antonio at the Dive Shop told us how the "white ties" sharks circle trying to sway people to buy Fury tickets instead of Manta but don't say that they pick up possibly at several places along the way depending on how many tickets are sold and you could be on the boat for an hour or hour & 1/2 just picking up people before you get to go.
The Manta is the way to go, no doubt!