The Black Hole would be the one. The first time I went to the towers was when the black hole opened, I was 9. My dad took me on the Corkscrew and then wanted to get me on The Black Hole! Ha No Way!! Even at that point the towers had merchandised some of the ride exits to death and this was no exception! It was fully kitted out with star wars toys and I remember the old man trying to bribe me with star wars toys just to go on it with him,lol. Since then ive ridden it several times and it was a beauty.
Having read a number of posts on this thread I agree with one of the earlier posts regarding the up keep of certain rides, mainly the Oblivion. My son is 9 and is just over 1.4m so he now can ride all the big rides, we went on the oblivion about 3 weeks ago and it is looking tired. The sound effect as your about to drop has gone, and the bright orange isnt quite as bright as it used to be! I appreciate these things cost a few ££ to sort but given the money the towers now seems to re coup from all its guests surely giving one of its major stars (albeit 16 yrs old) an overhall isnt to bigger a deal, unless like many rides before it, it maybe due for replacement.