So I'll list these from my least favorite to favorite starting with the shotguns

Pompson 6000

This weapon sucks. Like why on earth would you use this, the drain effect is negligible at best, it fires really slowly, the projectiles are slow, and despite not needing ammo you still have to reload it. This weapon is awful

Panic attack

Again, awful. When balancing out all the stats of this weapon at best it does 4 damage over stock FOUR. And that's only going to be in one shot because subsequent shots are less accurate. All in all a garbage weapon

The rescue ranger

Now we're getting into weapons that are actually usible. This weapon is decent on defense and has some good qualities. It's just not my style at the end of the day

Stock

This weapon is really fun to use and it's my shotgun of choice for when I want to battle engie

The widowmaker

I haven't unlocked this weapon but it looks interesting and fun to play, especially on offense

The frontier justice

This is my favorite weapon for engineer, my sentries are my children and I want to kill whatever heathens that try and kill my children. Plus I've made this habit of running into the enemy frontline, deleting somebody with a crit and then retreating, it's hilarious

The secondaries

Stock pistol

This weapon isn't unusable but is just kinda outclassed

The short circut

Kinda the same deal as the widowmaker, looks fun but I haven't unlocked it

The wrangler

This is hands down the best secondary for engie, no competition

Melees

The eurika effect

Baiscally this weapon has a long description that equates to "this isn't a good weapon"

The jag

I value being able to deal with sappers and this weapon isn't good at that

The gunslinger

This weapon changes the class entirely, it's not really my style for the most part but it's fun on occasion

Stock/southern hospitality

I know the southern hospitality is technically better but random crits with the stock wrench are just so...so funny to me. The stock wrench is one of my favorite weapons in the game but I can't deny the functional upsides of the southern hospitality. So I'll leave it as a tie