Brand is getting more and more Love from the devs, but one thing has always stayed the same: BRAND MELTS TANKS!
No matter if in scrims or in Solo Q, i always pick brands if the enemy team has 3 Tanks or 2 Tanks 1 Offtank.
Dont pick Brand jungle if they have a ton of assasins or champions that you cant get to, basicaly, if they are thic and stale, pick brand, the smaller and slippyer they are the worse brand becomes. If you choose to pick brand make sure your team does not overload on AP.

Brand wants to hit Lv 3 ASAP to unlock his clear potential. If i am playing Brand on red side i like to fullclear, since i get a good leash from bot and reach lv 3 after blue gromp wolves.

If you dont have the option to fullclear there is a thing on brand called the bumerang clear, lets say you are starting on blue side at the red buff. as soon as you are done, go straight to the other buff and while walking cast W on the raptor camp, that way your talisman heals you back to fullhealth. After finishing Blue and Gromp you are good to gank or go back to fullclear.

1. you can trigger your pasive lv 2 if you wait until the last second of the burn.
2. when clearing raptors or wolves Q the big one first then but them ablaze with e and after hit all the monsters with W. this will give you max dmg and trigger your passive, which oneshots all the little monsters.
3. save your double smite to clear drakes early
4. in teamfights your job is to survive in the backline since your DPS is insane, make sure to put all your dmg on the closest targets, your ult will bounce to others anyway, and if you get in trouble just stopwatch while watching them burn.
5. use stopwatch to dive botlane with ult, if possible.