Booji:
regarding these links-
http://bcalc.roid.me.uk/index.php?loadfile=game59787c0
http://bcalc.roid.me.uk/index.php?loadfile=game80440c2
My answer is that I am not staying to defend as the Terran with EITHER loss. It is too easy to get my roids back. I need help no matter what. But how MUCH help do I need, what kinds of help do I need, and how available will that help be...THAT is the question.
What I would point out is:
Your alliance cannot send you anything to help your Pegasus. Your pegasus do nothing to help your alliance.
If you are relying on 34k pegs for anti fi/co defense, either your planet will get incoming configured to ATTACK those 34k pegs (more revenants in Xan fleets, or viper team ups)...or your roid count/score won't be worth mustering that much strength against it.
To be quite honest, your links are a little bit meaningless. That particular Xan isn't going to attack EITHER of those Terran home fleets alone.
A relatively small Viper fleet of 55k, totally negates your pegasus "defense". Plus, that Viper send, and its effects on your Pegasus, cannot be overcome by alliance defense. Any resources you have spent on those DE will be effectively taken out of the battle, as the original attack will account for them.
If you have the harpy though, your alliance can send FI flak to make a Xan think twice and/or to flood the Beetle emp sent along with the Vipers. Also, a Cutlass/Corsair send will threaten the CO in the Cathaar fleet provided even a smallish Beetle def fleet is sent to assist against the phantoms.
The operative idea behind my points is that your ally defense can HELP your harpys to work in your overall defense, while ally defense cannot help your pegasus to work, see?
See these links:
http://bcalc.roid.me.uk/index.php?loadfile=game26236c0
In that link I added all the same ships to a defense fleet for that Terran who built the Pegasus, as to the one who built 150k Harpy in your example. In terms of "realistic" defense capabilities, your pegs are a worthless waste of resources.
If you find the SAME defense send, and put it over the top of 150k home fleet harpys instead of 34k home fleet pegasus, you get this:
http://bcalc.roid.me.uk/index.php?loadfile=game93050c0
I think that calc tends to show the relative worthlessness of Pegs, at least from the stand point of getting alliance defense.
note: the calcs show my ideas of a Xan fi/co send, instead of the more typical Xan fi only send. Without the Xan CO, the results are much worse for the incoming:
http://bcalc.roid.me.uk/index.php?loadfile=game41388c0
http://bcalc.roid.me.uk/index.php?loadfile=game67734c0
Without the CO from the Xan, the losses are a LOT higher for the incoming, or the defense can be much smaller.
The Value of the 2 defenses are essentially the same, but the loss is significantly greater to the incoming with the Harpy defense.
I will grant I did not credit you with having OTHER DE home to help make it harder for Vipers to freeze you out. The truth of that self-proived flak is that again, either your planet will be worth sending enough Vipers/Revanants against to account for ALL your DE, or you are unlikely to see fi/co incoming with either 150k harpys or with 34k pegs. Self-provided flak like that works a lot better for Zik Cutters vs. FI/CO, as nothing the Xan can send will prevent Cutters from shooting, and a Cathaar teammate must freeze all the Zik DE before it freezes Cutters. Relying on self-provided flak for Pegs to work will just result in larger, and harder to cover incomings.
Buy Harpys instead.