Quoting: littlejerryseinfeld
you are welcome to your opinion, but it is not close
In your opinion, that is. Neither is better than the other.
Stone's an amazing player, but He's heading to UFA that's for sure, which diminish his value a little bit. And you are definitely undervaluing Maata. He's a top4 d-man on any team in the league, can eat big minutes against top player, is a very good skater, is just 24 years old with 5 NHL season under his belt (and 68 playoffs GP already), his health problems seems to be over now, he's sign for 4 more years at a very reasonable contract, his advanced stats are better than average...He'd be a very nice get for OTT.
Plus you also undervalue what D.Sprong can bring to the table. He's young and can scores tons of goals. He'll have a great season this year, just watch him. The upside is definitely there.
I think, the way I set it up in my first comment, is a very fair trade for both sides and if you're a Sens fan, you shouldn't hate the deal so much because yoy might come up ahead in less than two years time.