Hey there! Well done for conquering for fear, I hope you enjoyed Nemesis, The Smiler and the other rides.
Personally, from least scariest to scariest drops, I would say:
Stealth
Oblivion
Saw
So, Saw being the scariest.
I would aim to do all of them if you ask me, they'll all over in a matter of seconds, and I have no doubt in thinking you will love them!
Got a reply from Thorpe about vortex:
“Hi Joel, Unfortunately we can't say exactly when Vortex will be back. Our engineers are testing the ride at the moment and we hope to have it back in operation as soon as possible!”
This is good to hear and it should be back very soon!