The Oilers play a similar style: top-heavy, fast paced, rush-oriented offensive blitz. It's hard to keep up with an attack like that, but it's also hard for the attacking team to maintain that pace for 60 minutes. Colorado is weak on their depth forwards and defense groups and if you can weather the MacKinnon/Makar combo just enough, their bottom 6 and 3-6 pairs are exploitable. It's just in the regular season, especially on high altitude home ice, they can bumrush the first period or two and then take a break for the rest of the game to mop up a 3-goal lead. And a lot of their standings points are naturally against the western conference, which is mostly ass-butt.
The Leafs are a hybrid of Florida and Tampa (or at least they are aspiring to be that). Heavy cycle off the forecheck + counter rushes from the slot shell. It's a successful playoff recipe because scouting one opponent takes away a lot of standard plays through structural adjustments, but no team can fully adjust to having to constantly turn around because the puck behind them all the time, and the NHL playoff refereeing favours the physicality it entails.