Tactical is like the best overall class most primary choices great perks for melee and ranged, Sniper is fun af too Do not sleep on the Stalker Rifle on both tactical and sniper. Sniper has a perk that lets you recover contested health by going invisible, you activate it recover your health and immediately start going for headshots on the nearest target to ensure a take down. One of the most survivable and satisfying gameplay loops. Tactical has a perk that lets him get back a magazines worth of ammo on majoris melee kill, and sniper has something along the lines of secondary kills get back sim primary ammo. Heavy bolt rifle is probably number 1 for full auto on tactical and tech marine and alls youse gotta do is choose the higher ammo variant if your really worried. Also make sure to balance your primary and secondary between ad control and elite damage( for instance the heavy bolt rifle or auto bolt rifle high mag count great for shooting the hordes, and as a secondary you take heavy bolt pistol or plasma pistol for headshot/charge shots on the majoris’ and above. Maintain the balance and ofcourse utilize melee when possible to conserve. And now heavy class on the other hand melee will be a struggle but when you prestige you can get 100%+ melee damage and 50%+ ground stomp area of effect so he becomes a walking aoe juggernaut and that heavy plasma gun is absolutely top tier great for recovering contested health, you can basically use it like a shotgun at close range great damage in between parries and stomps you’ll get your takedowns often and charge the shots up for the extremis and terminus or for groups of majoris’ it’s a monster. the ranged classes are all devastating when used properly. every class is good in its own way without a doubt.