Oh, and I guess since I'm explaining tactical shit, let's go over Power Armor and Hard Suits as I understand them, and Lord Roku can correct me for balancing issues.
Power Armor is heavy and durable. This can often destroy the chances for stealth, unless the feet are specially padded, and even then, a power armor user must watch their step. However, Power Armor also turns units into a living tank. It's durability comes in three levels - Power Level, and two Hardsuit Levels which are used up after the power level is used, resulting in malfunction and most soldiers - save for a few brutish supersoldiers - falling over and becoming immobile, unable to help themselves or others, and requiring a fellow unit to restore their Power Level. A non-Engineer could restore the Power Level halfway, but can't help the Hardsuit Levels. An Engineer, however, could completely restore all three levels if given a few seconds and some scrap metal.
Hardsuits are light to medium weight, and while stronger than a regular soldier's armor, and able to take a headshot, It's not as durable as power armor. They often use Carbon, Polymer, or light metals to plate the suit, keeping the wearer safe and sound. Hardsuits have a single level of armor for lighter troops, and two levels for medium units, always being Hardsuit levels. Since Hardsuits aren't ungodly heavy like Power Armor, the only thing a Hardsuit user has to worry about is getting a hole punched in their armor. Hardsuit users are always on the move, running and gunning, or staying in hiding and taking their enemy out stealthily, or from afar.
Assault troops are usually better in Power Armor or Medium Hardsuits, since they're often the tip of the spear, moving quickly and striking swiftly. Power Armor users will need training, but Hardsuit users can use infiltration tactics instead.
Support units are recommended to use Power Armor, the heaviest available, in fact. This is due to the fact that, while they're meant to keep the enemy suppressed and keep the squad from taking fire, the enemy always has the ability to shoot blind, and probably will. Support units should be able to be shot by a tank and still be functional, whereas most other Power Armor users would malfunction.
Medics should use Power Armor of their choosing. They need to be able to get close to their allies, and they need more than guns for that. A medic should hopefully be able to either get to their fallen comrades in cover, or drag them to cover for medical administration. This takes time.
Snipers should use Light Hardsuits so that they can get to a vantage point quietly, and since they're not going to be under too much fire, and at the same time, they may need to get up close like a classical assassin and infiltrate the perimeter, blade in hand, ready to slit throats.
Engineers should use light varieties of Power Armor, or Medium Hardsuits, so that way, they won't be too debilitated by Power loss. If the Engineer uses lighter Power Armor, they'll have an easier time lifting it to repair themselves, and thus, be able to repair others. They can avoid worrying about it in the first place by using a Hardsuit.
Roku, tell me if this all sounds acceptable to you, this is just a silly explanation of things I think I understand.