Quick answer: invest early permanent progression in the class you play most. A focused tree improves repeatability faster than spreading currency across every option.
Choose a main class
Prestige value depends on actual playtime with the class. Pick the role used for normal clears, not a theoretical endgame build.
Spend for consistency
Prefer upgrades that help in most encounters. Narrow boss-only bonuses can wait until normal routes are reliable.
Verify live costs
Alpha economy values change. Check the lobby before spending or resetting; this guide intentionally does not freeze an old price table into a permanent recommendation.