Which of these two young stud D-men is the first one to break out offensively in NHL? And do you see any difference between their upsides?

Both of them are having good seasons so far:

Larsson has 10 points in 18 games which is good enough for 2nd in scoring for his team. The leading scorer of his team, Jacob Josefson has 12 points. No other D-man has more than 4 points for Albany Devils.

Hedman on the other hand has 18 assists in 22 games in KHL. That's good enough for 8th amongst all D-men in that league. Hedman is 4th in scoring in his team and the leading scorer (Brandon Bochenski) has 25 points in 32 games.

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UHL Pittsburgh Penguins

24 Team Fantrax Salary Cap H2H Dynasty League Daily
G, A, +/-, PIM, PPP, SHP, GWG, SOG, Hits, Blks, FOW
W, GAA, SV, SV%, SO
23 Man Roster - 3C, 3LW, 3RW, 3F, 6D, 1G, 4BN, 4IR
27 Man Minor Team

C- Tavares, Stepan, Hodgson, Shaw, Bjugstad
LW- Ryan, Perron, Downie, Killorn, Rinaldo
RW- Wheeler, Simmonds, Coyle, Frattin, Boyes
D- Pietrangelo, JJ, Bogosian, EJ, Josi, Cowen, Muzzin
G- Lehtonen

F: Granlund, Silfverberg, Jensen, Dalpe, Bowman, Knight, Fasth, JAM
D: Beaulieu, Koekkoek, Gelinas, Pysyk, McCabe, Irwin
G: Nilsson, Nilstorp, Ramo, Berra, Brossoit, Gibson