i guess a evo tree of soliders would be good , as there are many subclasses and diffrent load outs ( i can also try to help with it )

i usually use The Force of nature or The normal Scatter gun , Bonk! Atomic Bunch and the sandsman , its a good combination sandsman to stun heavy targets like heavies soliders or demomen and then finish them off with the Force of nature ( it has a push effect both on wearer and target ) which can be also used to make higher jumps if you shoot at the ground while jumping , The Bonk can save you if you are outnumberd and surrounded , just go to a corner , take the Bonk! out and use it quickly to escape , or use it to get past sentry nests .