If you read majormajor's post #11, it makes good sense. A good case can be made for WCE being better at their best production-wise. WCE also has the X-factor of Bertuzzi being a physical monster during his peak/prime. Pizza line has no intimidation factor.
02-03 was a weird season though. Mixed in with a bunch of low scoring years, the top scorers all had huge totals largely from PP scoring. PPs were obviously up in '06, but I think they were so high that a lot of players couldn't take full advantage of them due to spreading the ice time.
In '06, the Sens had 490 PP opportunities and 102 PP goals for a 20.82 PP%, while in '03 the Nucks had 419 PP opportunities and 87 goals for a 20.76 PP%. But the Canucks forwards played a greater percentage of those PPs and a very similar ice time to the Ottawa players:
PPTOI/GP
Heatley: 5:44
Alfredsson: 5:41
Spezza: 5:32
Bertuzzi: 5:30
Naslund: 5:25
Morrison: 5:00
And similar PP points, except for Morrison, who has far fewer points anyway:
Naslund: 54
Alfredsson: 48
Heatley: 43
Bertuzzi: 42
Spezza: 41
Morrison: 28
Total PP points:
Ottawa: 132
Vancouver: 124
Total PP goals:
Vancouver: 55
Ottawa: 46
Given PP percentages were a bit lower in '03, both teams had the same PP%, but the Vancouver stars spend more relative time on theirs (meaning they likely raise the total PP% a greater amount), the PPs seem pretty close. The Canucks had more goals from their three forwards, but Ottawa had more goals from their defense which the forwards no doubt contributed to.
Meanwhile, the Canucks played more at even strength:
ESTOI/GP
Bertuzzi: 14:55
Naslund: 14:21
Morrison: 14:12
Heatley: 13:52
Alfredsson: 13:40
Spezza: 13:20
While their ES scoring was again similar:
ES points:
Heatley: 56
Bertuzzi: 55
Naslund: 50
Alfredsson: 49
Spezza: 49
Morrison: 41
Total ES scoring:
Ottawa: 154
Vancouver: 146
Total ES goals:
Vancouver: 62
Ottawa: 59
So Ottawa scores slightly more points but slightly fewer goals in fewer minutes but ES scoring was also easier in '06 so maybe a slight edge to Vancouver again.
But that's just looking at scoring. A line also has to drive play. Both these years were before the years we have significant data for lines, but Hockey Reference does have ESGF and ESGA for each player:
Heatley: 76/47= 61.8 GF%
Alfredsson: 72/43= 62.6 GF%
Spezza: 58/35 = 62.4 GF%
Naslund: 64/58 = 52.5 GF%
Bertuzzi: 66/64 = 50.8 GF%
Morrison: 68/50 = 57.6 GF%
Now, Hockey References numbers coincide with plus minus which means they're likely including goals against while on the PP in the ES numbers for some reason, and this would include EN goals against as well, which may be why Morrison isn't on for as many goals against. I doubt Naslund and Bertuzzi were actually barely above 50% for GF%, but given the numvers used are under the same circumstances for the Ottawa trio and they fare much better, I think it's likely the Ottawa trio fared significantly better in terms of GF% 5v5. Both were good teams, and the top line so this should speak to the effectiveness of each. Interestingly though, the Canucks trio seemed to do much better here the year before.
As well, majormajor focused strictly on goals. While I understand the point is to get away from points gained on one anothers goals, this ignores the potential of them setting up defensemen, and Spezza's significant assist advantage over Morrison is not entirely due to assists on Heatley and Alfredsson's goals.
Looking through scoring logs, I found at least one of the Vancouver trio got an assist on 38 more goals by other players, and at least one of the Ottawa trio got an assist on 55 more goals by other players.
This would mean overall, the Vancouver trio scored or contributed to 157 individual goals and the Ottawa trio scored or contributed to 167 indidual goals. And that's with Spezza missing 14 games and Alfredsson missing 5 while the Vancouver trio all played 82.
I think Vancouver might have been slightly more productive overall, but Ottawa generally was more effective at ES.