Frattin will be injured for about a week (maybe more), so if you're looking for immediate impact, Tlusty is the way to go.
Long term, I am not sure about Tlusty, but Frattin is looking good - he's got good chem with Kadri, and is putting up first line numbers (10ptsin 10 games) on the third line. The only qualm I have with him is that his peripherals aren't great (low shots, hits, PIM), but it's been so far so good when it comes to Frattin's points.
I am a die-hard Avalanche fan!
PARTIAL DYNASTY (Keep 20 from year to year)
2C, 2LW, 2RW, 4D, 2G every night
G ,A, +/-, PIM, PPP, SOG, Hits, Blocks
Wins, Saves, SV%, GAA, SO
C-Eichel, Marner (RW), Matthews
L- Skinner, Pacioretty, Vanek, Perlini, Palat
R- Hoffman, Byron, Tuch, Kerfoot, Sprong
D- Ekblad, Gostisbehere, Rielly, Borowiecki, Montour, Girard, Orpik, Schenn
G-Fleury, Rask, Brossoit, Saros, Kuemper, Appleby