Which branch in the Army is the best combat arms branch to commission into?

Engineer then SAPPER, but that's because I worked with them all the time, if you want to bl0ow stuff up and get blown up go Combat Engineer and get a SAPPER tab. Remember first to breach the way..

Infantry or bust. Anything else makes you a POG, and that's a very POG thing to do.

It all depends on how you feel about signing for equipment and how much you hate walking. Obviously tankers ruck the least followed by air defense, artillery, engineers, infantry for obvious reasons does the most. Don't take this to mean that you won't be rucking in as a tanker, you absolutely will. As far as equipment you'll be responsible for as a PL, they go in ascending order from infantry to tanker with the exception of engineers, who generally have a bunch of equipment some of which is considered to be significant brigade assets (Volcanoes, MICLIC). Then there's the type of work. Obviously an officer isn't going to really do the vehicle maintenance, but the amount of maintenance required for equipment and the equipment you will have will dictate how much of your units time you'll have for training and the type of training that you will get. Non-mechanized infantry and engineers do less vehicle maintenance than armorn artillery and ada, but that's assuming that you don't get assigned to a mechanized unit. If you do, it will be comparable. Lastly, you should consider the ease of advancement. Fields that are smaller usually have issues with advancing.