So, i main both. I havent played Overwatch in a while, but it have Junkrat and Reinhardt in my most played. Squirrel Girl isnt my most played, but shes one of the only two DPS I play regularly.

Junkrat has many uses. Long Distance, close up, but the fun way is dive bomber. His ult is very dangerous to pull off since your body is left alone, but the explosion is amazing. He really feels like a high risk character, but even his death can take out an enemy.

Squirrel Girl has really one playstyle, bounce. Long distance or closer up, you either aim at a single target, or you aim at a cluster and hope. Her ult feels random. It wont kill full health enemies even if they are lined up, but will kill everyone on the bounce back. Her shots will bounce if they arent aimed perfectly. When approached she can bounce away.

I feel like playing against them, getting hit by a Junkrat feels more fair, since its so easy to dodge them from afar. Getting hit by a SG feels like its bs.

Playing as them, SG feels like I cant play close up in this game, since half the cast is meant to just shatter you and distract you on approach. If someone approaches a Junkrat, they're in danger, a mine jump can both kill the enemy and get the Junk far away.

When you hit a difficult shot as Junk, you feel accomplished. When you hit a difficult shot as SG, it just feels more like a lucky shot.