altarian tech tree is probably the worst. For a few reasons
1) their unique building sucks. needs major buffs. there's better ways to get manu and research combos. The use case is either really rare or non existent - especially as most people specialise planets.
2)far far worse: Their late game tetra forming tech is shockingly bad. No ultra tetra former means late game your planets will be awful compared to others.
They only seem competitive because ancient is such a ridiculous trait on larger maps, but that's their racial ability at play, not tech tree.