Good plans across the board!
As of now, I see the advantages of the Heimdallr as:
1. Allows our troops to compete with theirs in durability.
2. Would improve our batteries and maybe let us make mechs in the future if we wanted.
3. Give us better battlefield awareness (than we had before, they arguably have better since Athena controls like half their infantry)
4. Invisible troops! A Big Boon.
5. Pretty much useful everywhere, on any planet.
But I think if we go this route we should finally fix the Fog Machines to be effective at covering our advances, diluting lasers, and doing more damage to their durable drones. Also it relies on fixing the batteries AND making a new suit, which might be hard to fit into a single design.
And I think the advantages of the Thyle would be:
1. Basically counters their big man fleet advantage (Athena).
2. Disrupt their Aegis.
3. Disrupt the Sarissa.
4. Disrupt ANY non faraday vehicle, drone, or device with Athena that they produce in the future.
I think the biggest issue with this is that it will only really have an effect on D, which is the only place they've deployed ground Athena guided forces, while Heimdallr is pretty much a boon anywhere. Also, it's a little unambitious for my tastes, but that's just me.
I personally see these designs as roughly equally valuable and could go either way (we should definitely make both at some point) but I'm sure that our engineers with BIG MASSIVE BRAINS will make BIG MASSIVE ARGUMENTS as to what is the Only Correct Choice.
Also, Madman, the Aegis have to communicate with something I think. Also, their navy gets scarier every turn (they fielded SEVEN armored cuttlefish this turn, clearly Island Alloy is infinitely cheaper than it was a year ago) and having naval supremacy will help us on the ground. I think kinetic bombardment would be a nice upgrade to the Odin's that would help us a lot planetside, though we shouldn't do that now.