I've thought for a while now that while Gaudette has a higher ceiling, Sikura is the more NHL-ready prospect. You could put him on the wing on any line in the NHL and he would quickly be able to adapt and compliment his linemates in short order. Incredibly smart player who plays really well without the puck. Watching almost every Bruins game this season, I see a lot of similarities between Sikura and Danton Heinen's game this year. Cassidy has been able to move him up and down the line-up and on the PP, and other than one lull, he's been a great complimentary winger.
Gaudette needs the puck more to be effective. Case and point we're the last two games of the year. He didn't have it as much, and he wasn't himself. Those type of college centers normally take a little while before they produce consistently. Backes, Kesler, Turris and even Eichel had adjustment periods somewhere between a couple months to a couple years at the beginning of their careers. I think Gaudette will figure it out, because he is immensely talented and one of the most determined and hardest working players I've ever seen play at NU, but it will be a longer adjustment time than Sikura.