Thought it would be good to have something on this site that makes for a quick way to look at all the best current seeds for each mission. Feel free to add your own. Some are better for solo, others for duo or more.

Blacksite:
Rookie Ironman has fixed RNG, is actually pretty good

Financier:
657118
3 (Duo+)

Deposit:
212041 (Duo+)

Lakehouse:
176744 (Duo+)
150468

Withdrawal:
173625
78836

Scientist:
642727 (Duo+)

Auction:
728389 (Duo+)

Gala:
1

Cache:
423231

Killhouse:
664069