Collossal and Gargantuan MkIII

I'd say a reduction in points of 2-4 in most cases and maybe handful more bxs or 1 more armor. Maybe greater reach 3"?

I've always thought that Gargantuans should have TWO animi, to partially offset the reduction in number of Warbeasts they entail.

I don’t think an ‘across the board’ fix like battle engines is the right answer. Some colossals/gargantuans are very playable, and fill an important spot in the factions- notably trolls, minions, mercs and circle (well, one of circle...)

Unfortunately though, they are in the minority, and most colossals/gargantuans do need a fix. I think this is best done on a case-by-case basis though. For example, the glacier king picked up the ‘northkin’ tag and better utility on it’s ranged weapon, and now is a lot more appealing. Most colossals probably need a much bigger buff that this, but I’d like to see each one addressed individually during CID to fill a faction niche, than just get cheaper or get more boxes.

It’ll be interesting to see how the legion CID plays out, with both gargantuans being buffed.

Exactly. Gargantuans generally still have the problem of generating less fury for their warlocks, but colossals are not stuck with a universal problem.

For example, in Khador, Conquest is really very playable with quite a few casters. I don't think it needs anything to be worth taking. But Victor is less desirable. It doesn't provide the same form of board control, the main gun just isn't accurate enough and you don't generally want to exploit its long range, because it will only really pull its weight if it makes it to melee (lucky scatter + fire based assassinations being the exception to that).

Gargs and Colossal are designed to be very powerful models that give you powerfull options on the tabletop.

However that are not meant to be unkillable. I explained to a passing 40K player that having a huge base in your list was not the same as placing a Forgeworld Warlord Titan on the board. A Huge base model should be a risk/reward decision when it come to list creation. You get a powerful model but you are committing a large percentage of your list to is and maybe having to accept a certain playstyle with it.

For the most part I think a lot of the Gargs and Colossal are in the right envelope when it comes to power.

Some are good, some are less so, exactly as with other model types. Nothing inherently wrong with the entire category of COlossals/Gargantuans, IMO. I'd modify them or not on case by case basis.

I am of the opinion that most of them are fine as is with few exceptions. And those few can be fixed with +1 fury or some other ability added. When I field them, they typically have enough of a board presence to pay for themselves, even if they don't do their "points worth" in damage. I would like to see each one have some sort of defensive mechanism or some sort of army assist ability. Mountain king heals and has a DEF debuff spray, Glacier king hands out concealment and has freezing fists. The sepulcher creates brute thralls that can shield guard and has a ton of guns. The list goes on. Now there are a few that need either a point adjustment or some sort of utility ability but for the most part, I think they are fine.