It's almost impossible to answer that question. There's so many variables: ability, what was achieved with us, ability proved at other clubs, what we lack today, bare nostalgia and of course those rose-tinted glasses.
I am 25 so can't really comment on pre 1994 players, even the greats that I've come to admire from old footage. Because of that, I will say Paul McGrath.
The following all came very close, in this order:
1. Paul Merson
2. Martin Laursen
3. Dwight Yorke
4. James Milner
5. Ashley Young
6. Andy Townsend