What's worth more to a base's artifact output:
1) 30% bonus from trade route
2) 60 loyal members

It's one or the other at this point. Either save the embassies or replace them with docking ports.

Okay first off what kinda space are you working with?

Oh and do you mean per person or the legion as a whole?
Equal or percentage payout.

We have 41 special space and are maxed out on embassies.
We keep payout equal.

Production Bonus Amount
Base Level Bonus 2500%
Base Defender Bonus 100%
Loyalty Bonus 1520%
Production Points Available: 0
Resource Availability From Modules Production
Mining Raise (1 Points) Average 0 None
Research Raise (1 Points) Average 0 None
Artifact Raise (4 Points) 5x Mega Rich 572 1.9M / day

NAP Deep Space Freedom 11 months
TRADE Deep Space Freedom 2 months
BATTLE Deep Space Freedom 8 months, 2 weeks
BATTLE The Terranian Armada 8 months, 2 weeks
TRADE Stargate Operations 2 months
TRADE Crimson Corporation 2 months
TRADE Delta V2 3 weeks, 5 days
NAP Delta V2 1 week, 3 days
BATTLE Delta V2 3 weeks, 5 days
TRADE Intergalactic Destroyers 2 days, 13 hours
BATTLE Intergalactic Destroyers 2 days, 13 hours
TRADE The Dysonians 9 months, 2 weeks
TRADE Galactic Paladins 3 months, 3 weeks
TRADE The Unknown 3 months, 3 weeks
TRADE Galactic Explorers 2 months
TRADE We Dont Exist 2 months
TRADE Warp Fleet Lotus 2 months
TRADE Anomaly 1 month, 2 weeks
TRADE The Citadel 2 weeks, 6 days
TRADE Delta Destroyers 4 days, 16 hours

We currently have 50 members

More members will actually decrease each person's payout (on equal %) since you'll be dividing the (slightly larger) pot more ways. That being said, its not a huge difference, but its there. More embassies will always increase the total amount each person receives. If you're looking to just increase the number "artifacts/day" each extra person produces 40% extra of base (by increasing loyalty by 40%) which is then multiplied by the current trade pacts: so 40% * (128%) = 51.2% of base production. Each extra trading pact increases it by 2% * (Loyalty+100%)... in your case, 32.4%.

So more people adds more overall base production, but does decrease each person's share.

Okay first off with equal payout more members will not increase points puter person. In fact if you went from 50 loyal to 60 loyal everyone would get about 99.2 percent of what they do now. Only way this increases production is if someone forgets to collect. If they dont I'm pretty sure it then gets added to the next days totals to be divided up. The extra members will make defending planets easier though. Along with possibly deferring some of the upkeep. Also depending on their race and proffesion they could help stop your base from being disabled which would cut production down for ten days. In short adding docking ports does nothing to directly increase production whereas trading pacts do.

Hope that helps. If that isn't enough though just say so and I'll try to explain further.

Stick to embassy:
it cost 2 spaces to build an embassy, but 4 to build a docking bay. So if you are just considering the 10 spaces you spent on embassy, you cant even get 60 members even if you wanted.
embassy provides more OVERALL production per space than docking bay, if only for the stats given. Without going into details, embassy provides 1.8 times more bonus per space to the OVERALL production.
And like the others already said, personal production will actully shrink.

If you wish to consider docking bay, its benefit mostly lies in PLANET PROTECTION and BASE ABILITY, those are the additional value of the docking bay gained from increase in members that embassy cannot have.

What you feel is better thou... it's completely up to you. But for production alone, you got the answer

Thank you for the advice everyone!