I'm curious as to what the endgame benefits of each faction is. I have recently started my 3rd character which will be the one I finish the main story with and am seeking for more information as to what each faction will provide to you.

As far as I know now

Minutemen:

Flaregun support
Artillery support
The castle
Unique outfit (generals uniform)
T45 paint job

Railroad:

Ballistic weave


Brotherhood of steel:

Powerarmor(including a jetpack later)
T60 paint job
Vertibird support

Institute:

Synth relay grenade
Teleport animation on fast travel


So what perks am I missing? Please add any benefits you have come across for different factions, especially any benefits that occur on completion of the main story

MM get vertibirds if they blow up the brotherhood.

Oh really? I was considering a mm and bos play through as I won't be using fast travel other than vertibirds for this run. This makes me happy as I'm not a big fan of the brotherhood

Also powerarmor jetpack mod is craftable so you dont need to actualy join BOS to get one.

You get the Railrifle through the Railroad, I believe.

The Deliverer as well.

You get that one by joining the Railroad, not by finishing the MQ with them.

Speaking of which.. Justiciar, you don't have to finish the MQ with Minutemen to get and have those. The Vertibird is the only thing you can get post-MQ by Minutemen.

Finishing the MQ with The Institute unlocks the Institute paint for X01 Power Armor so you can roleplay a robotical angel if you add a jetpack to it.

You don't even have to join them to get the Deliverer. Just do the one quest with Deacon, you can still refuse to join afterward.

Great info. I doubt I'll ever side with the institute because killing my wife, kidnapping people and sending syths to attack my settlements is just to much to get over. Their perks would have to be alot higher to get me to consider them

Depending on how you wanna play your character, it IS a hard thing to forgive in regards to ideal and situation in exchange for tele-grenades.

You can get it elsewhere. Also from killing Desdemona.

Well, the ones who killed your spouse died a long time ago and other than Ayo (whom you can frame and get rid of) and that one Biotech guy, most scientists seem to be decent people (though they do need some reality checks). Heck, Shaun started this whole plot in order to give you, and himself, revenge against Kellog so likely he got his revenge on the rest as well. Not that Shaun himself is really a good guy per se, but I did find the family ending touching nontheless.

While true, society hasn't changed since then. They still kidnap who they want, kill who they want, and replace who they want.