Special teams are going to be a big factor in this series. (xG per NST)
PP: Vancouver was 2/13 = 15.4% in 21:10 on 1.15 xGF with 20.0 SH% vs Nashville
Edmonton was 9/20 = 45% in 26:57 on 6.49 xGF with 20.5 SH% vs LA
PK: Vancouver was 2/22 = 90.9% in 37:12 on 3.24 xGA with 89.5 SV% vs Nashville
Edmonton was 0/12 =100% in 23:52 on 2.15 xGA with 100 SV% vs LA
Overall: Vancouver was 2.09 xG above expected in special teams in round 1.
Edmonton was 4.46 xG above expected in special teams in round 1.
Edmonton and Vancouver both had very strong powerplays in the regular season:
Vancouver generated 9.03 xGF/60 and 8.18 GF/60 versus 3.27 xGF/60 and 5.67 GF/60 in round 1.
Edmonton generated 10.08 xGF/60 and 10.53 GF/60 versus 14.45 xGF/60 and 20.04 GF/60 in round 1.
Regular season PK was also strong:
Vancouver allowed 7.89 xGA/60 and 7.64 GA/60 versus 5.23 xGA/60 and 3.23 GA/60 in round 1.
Edmonton allowed 6.9 XGA/60 and 7.55 GA/60 versus 5.41 xGA/60 and 0 GA/60 in round 1.
In terms of overperformance versus the regular season:
Vancouver was -0.85 GF above expected on the PP and 0.25 GA above expected on the PK in regular season and 2.4 GF above expected on the PP and 2 GA above expected on the PK in round 1.
This equals -0.6 vs 4.4 for a combined 5.0 xG/60 overperformance versus their regular season results.
Edmonton was 0.45 GF above expected on the PP and -0.65 GA above expected on the PK in regular season and 5.59 GF above expected on the PP and 5.41 GA above expected on the PK in round 1.
This equals -0.2 vs 11 for a combined 11.2 xG/60 overperformance versus their regular season results.
These are small sample sizes and likely neither of Edmonton's nor Vancouver's results are sustainable, but Edmonton was on an absolute heater in both PP and PK in round 1 whereas Vancouver overperformed expected, but by a much smaller margin.
Though Edmonton are favourites, if I were an Edmonton fan, my number one concern would be that the PP and PK results of round 1 are not even remotely repeatable, even for a team that had both the third best PP and PK in the regular season. They are not going to continue to score on 45% of opportunities and never concede any PK goals. Moreover, Vancouver got very unfavourable refereeing and ended up with by far the largest penalty differential against (-9 and -15:02 vs EDM's +8 and +3:05) of any team in the first round despite carrying play for the most part and eventually winning. This is unusual since Vancouver was +2, +0:37 (average discipline) in the regular season and Edmonton was -15, -55:36 (very undisciplined) in the regular season.
Virtually everything went right for Edmonton in round 1, while Vancouver stumbled through despite key injuries, horrendously lopsided refereeing (besides the penalty differential, Nashville scored 4/12 goals that were very tight non coaches challenges, and were penalized 3/13 times on "non-subjective" too many men and delay of game calls) and mediocre play. If luck remains the same or shifts only slightly Edmonton will win, but if it returns to normal, and especially if Demko returns, Vancouver will.