Sorry I disagree.
To say Warne had more impact than Flintoff in the series is not right considering in the end it was England won the series and not Australia.
To repeat myself, Warne got 40 wickets simply because the other bowlers (barring McG) was **** and hence Warne had more chances to have a go at the bowlers.
Flintoff had much superior batsmen to bowl to and took wickets when needed, and despite stif competition managed to pluck 24 wickets @ a reasonable cost of 27.
Apart from that is the sheer value of runs he scored for England. Which was 402 runs @ 40 (no notouts at all).
Flintoff took 24 wickets at 27 with a strike rate of 49.
Warne took 40 wickets at 20 with a strike rate of 37.
Flintoff made 402 runs at 40 over 10 innings (0 n/o).
Warne made 249 runs at 28 over 9 innings (0 n/o).
Flintoff's best batting was in the two games England won and Warne's best batting was in one of the two draws. Both played important innings for their country with the bat. Neither had average padding not outs.
You say that Flintoff shared the wickets, but a large part of the reason that England won was because all of their bowlers worked as a team to create pressure at both ends. Warne took his wickets largely through sheer bloody brilliant bowling on his part as the other bowlers bowled terribly. He also took two ten wicket hauls in a five match series!
In the history of the game there have been only seven other bowlers to take 40 wickets or more in a series, and four of these were six match series'.
Warne was clearly the best bowler on the Australian side, while for the English, even though they took less wickets total, Jones and Hoggard both had better strike rates and Jones a better average than Flintoff (Jones only played the first four games and the game he did not play England only managed to take wickets due to Aussie desperation in poor light conditions).
There are so many reasons why Warne should have won player of the series and the only argument for Flintoff was that his team won the series, which was more to do with the operation of the team as a unit than his individual brilliance.
If you think that the extra 150 runs that Flintoff scored were far more valuable than the extra 16 wickets that Warne took then you are welcome to your opinion, but I don't think that most neutral observers could sincerely agree with you.