1- I knew about less bullets spread while you keep it spinning seconds before you attack, consider it.
2- I highly recommend use a food istead of a shotgun (unless you like to play as fat scout):
whatever, here's a tip about the food: when your food bar is charging, go to pick a medikit (and at full health, otherwise, this will not result like this) so you can restore it 100%. very useful detail.
You can easily, drop your food to a partner, or pocket Medic, and taking quickly a medikit to get another food ready. I do this always I can.
3- and a last thing, but very important: Treat your Medic like a human being, and worry for him. Be a nice guy with the medics, this could help you to make friendships bonds and convincing them to support you constantly.

Generally, Sandvich, but the Banana is more viable for individual and versatile contexts

For Heavy, his Bear necessities , Heavy lifter, and the one-man army with blonde hair, so he can cosplay Marco Rossi, from Metal Slug.
And sure, the Cuban beard and the leftover trap

The Stock minigun is my favourite, and with its Cat warpaint from Pyroland collection

Nah. generally, I prefer the Sandvich for general terms and the banana for individual contexts.
But its okay, Each one with its own preferences

Like Antiparticle, a YT TF2 gameplayer that likes using his Strange chocolate