Sodinar. The orb is an effective combat unit, probably the best for brute-force fighting. The nexus is an incredible asset, sort of a counterpart to the missile frigate. Because of how its attack works, it can fire at asteroids and hit any ships behind them. The pulsar is not useful at all. It either needs to be able to attack things, or to be able to irradiate tiles without traveling on them. The starcore is good on some levels, because it lets you re-align resource and health tiles to make them closer to your warp gate. The quasar's special ability is impressive, but if you can build enough orbs to make it effective, you already have the upper hand in the fight, and the quasar won't make a big difference.
Klosians. The aurora is the best Klosian unit, easily so. It lets you secure resource tiles very early on, and on some levels, you can even get a couple hits in on the enemy warp gate in the first turn. The ion core is not that useful. With all these asteroids, you never get to take advantage of its straight-line feature. The singularity is little more than a portable punching bag, not worth using. The phaser is effective at attacking groups, but it needs a much higher health or it'll be destroyed as soon as it attacks. The mothership is... Useless. Easily the worst ultimate ship.
AI issues aside, the ships need balancing out. Here's how it is right now.
The fighter is a versatile combat unit. Good for early on in the match.
The logistics ship is excellent for letting the stronger ships keep taking hits. Its high number of moves also lets it hold down resource tiles early in the game.
The missile frigate is hands-down the best human ship. It can fire from around corners and avoid counterattack, but is also capable of taking a real beating and staying in the fight.
The defense platform is good for area denial, but with one tile range, it can't cover a lot of area. It'd benefit hugely from having a default range of two.
The juggernaut is probably the most cost-effective of all the ultimate ships, but two missile frigates and a logistics ship would be preferable. It should either be able to regenerate health on its own, or have a much higher health.
You know, it's really frustrating when I'm trying to defend a station or whatever, and motherships come in, and I build a missile platform and upgrade it and by the time the mothership gets there it's got plenty of energy and minerals behind it... And the missile platform just sits there. Uselessly. It does not fire. It lets the motherships tear everything apart. This is not fair!
This is way better.
I think this works... Boing.