Quoting: theleano1
Garland is more effective 5on5, Garland also has a much higher Points share than Granlund, Garland is also younger and doing this with less ice time than Granlund. Conor Garlands TOI 15:07 average, Mikeal Granlund TOI 17:50 average, Garland has a higher Corsi and is getting less Ozone starts than Granlund, Garland can be effective up and down the line up, Granlund can not, he really struggled when he got to Pittsburg playing in a 3rd line role which is the same role he'd be in Vancouver, We need to be better Defensively so it makes no sense to move a guy that's better defensively for a guy that is more effective as a power play specialist. the fits just not here for Vancouver, also much prefer the Garland contract to Granlund.
So you mentioned a few stats. Namely: effectiveness 5v5, points share, ice time, corsi, zone starts, and Garlands linemates.
Expected Goals 5v5 were about the same. As was points per game when Granlund was a second line RW with Nashville (0.33 PPG to Garlands 0.38 PPG). So point wise I wouldn't say one was much more effective 5v5.
Points share, meaning points compared to team total points? Granlund was 4.4% of his teams points and Garland was 6.9%. But the Pens scored nearly 40 more points 5v5 compared to Van. It's not Granlund's fault his team is better.
Ice time was actually in favor of Garland, 1056 to 1021. Noe, Granlund played 2 less games so they are probably about even 5v5.
Their corsi numbers were also nearly identical at 49% to 48%.
Granlund started more in offensive, neutral, and defensive zone. Garland started more on the fly.
Garland was primarily with Miller and Horvat. After that was Aman, Joshua, and Boeser. It appears he started on the 2nd line but didn't produce and was dropped to the third line. He rarely played on the 1st line and never on the 4th line. Not really playing up and down the lineup.
Garland is better defensively but again, he is paid to score goals. Last year he did not do that.