True, scoring titles are not the only measure.
The way I rate players is how many times they finish in the top 7 in the scoring race. And, within that top 7, they get more credit for finishing higher than lower.
That being said, Jaromir Jagr has spent a lot more time in the top 7 than did stastny. In fact, on my system, Jagr gets a 45.5 rating while Stastny gets a 21. Again, both are excellent but, Jagr's total is phenomenal. By awarding points for top 7 finishes, having Wayne and Mario in the league prevents NOBODY from making a significant impact.
In my system, Jagr is the 9th greatest scorer of all time, and has the possibility to move up with a great year this season. Stastny is the 30th greatest scorer of all time on my system.
Both are great but, Jagr is significantly greater.