I'd consider the best player for United or best player footballing abilitywise.
United's best player in Fergies Era ( to me this means committed Loyalty and achiements )
1. Ryan Giggs.
2. Paul Scholes.
3. Gary Neville.
4. Roy Keane.
5. Eric Cantona.
6. Rio Ferdinand.
7. Ole Gunnar Solsjaer.
8. Christiano Ronaldo.
9. David Beckham.
10. Wayne Rooney.
You can have a laugh at my list all you like but to me I think these are the players who have mostly inspired me when I watch united over the ten yrs or so that I started to support United.
As for players abilities. ( includes consistency, all round play, contribution, and individual performances that wins us games.
1. Ronaldo, why ? ( three seasons as a forward scoring over 90 goals, winning us 3 PL,1CL some individual goals that were just breath taking. Also won the Ballon'dor )
2. Roy Keane, ( His influence, his determination, his drive everything he contributed as a captain on the pitch lead us to win the 1CL and what 6PL's if I'm not mistaken )
3. Ryan Giggs ( Welsh wizard, won it all. Though he didn't win the title of BPITW I still think he's up there in the top3 )
4. Paul Scholes ( Passing,crossing genius and at his primes, "Paul Scholes = Goals"
5. Eric Cantona ( Was the start of our magnificent play, though you can say Bryan Robson was the key player before him but I think we were a Unique team after aquiring Ooh Ah Cantona )
It's just with playing abilities I favor flair, dribbling, and entertainment more than inspiring captains. That why I chose Ronaldo.