Stone is easily better than Tarasenko. He's produced upwards of a point per game pace for over 80 games now, is 26 and one of, if not the best defensive winger in the league. And he does this on Ottawa.
Imagine a line featuring O'Reilly and Stone? It'd be unstoppable.
And for Ottawa, if Stone isn't re-signing they certainly won't get anything close to as good as Tarasenko. Stone will likely cost more (somewhere between 8-8.5M for 8 years) but he's easily worth the cost of acquisition.
Tarasenko is an amazing talent and his potential is sky high but Mark Stone is better in every way.
Stone is the superior player defensively, but I think it's a stretch to say that he's clearly better than Tarasenko offensively.
For one thing, Tarasenko is unarguably the better goal scorer, and even if their point total paces are equal, goal scoring is still inherently more valuable than assists.
On top of that, Tarasenko has 4 seasons of offensive production better than Stone's best season. They both broke into the league at the same age and have the same number of years in the league, and Tarasenko has 80 more goals and 93 more points than Stone. That's a huge production gap that you seem to be discounting completely.
Yes, Stone was injured last year and he was on pace to better that, but it's still decidedly easier to sustain that level of play for 60 games than it is for 80. That's an extra 20 games for injuries to take a toll, slumps to creep in, etc. And, yes, I'm not going to argue against someone who wants to say that Stone has taken a step forward in his mid-20s, but there's still something to be said for the consistency that Tarasenko has displayed over his career that Stone has not.