A- open recruiting for locals, sharing and teaching knowledge and technology. (normal ending)
B- sees non humans as valuable assets and outlaws discrimination for faster expantion and having a robot/BOS army (Bad Ending)
C- Full integration of the robots into the BOS while having open recruiting for locals and non-humans, and sharing & teaching tech. (Good Ending)
D- Having a Robot/BOS Army while enslaving non-humans and sympathizers. They turn into a rebellion who are defeated and pushed towards west BOS/NCR (Barnaky Ending)
And all endings give them access to the Vault 0 Tech but ending A is limited since the calculator to destroyed.
I know Tactics has alot of things that contradict the canon like talking deathclaws that join the BOS new armor they created (which could be created once they have vault 0 i guess) and Oil. I'm not going to disregard the vehicles if the chosen one can have a car why can't they? You can go ahead and remove them, they are still a force to be reckoned with.
So let compare shall we?
West coast does horde their tech and isolates them selves. But they aren't no pushovers. Sure they lost against the NCR in the Mojave, but the only reason the lost was the numbers. They didn't have enough supplies to outlast the on-coming waves or at least that is what i heard/read (i love sub titles) so someone correct me if i'm a wrong. If this is an indication of any battle between NCR and BOS then the BOS would have lost awhile ago and wouldn't still be in war with then at the New Vegas time line. Their tech gives them there edge no doubt about that. Sure Van Graffs have tech but i'm pretty sure BOS has more Knowledge about the tech so i would think BOS would have better quality stuff. And if you wanna talk about the Shi, well they trade with BOS, i think you know what that means.
East coast does have an open recruitment and will have the numbers to stomp on West BOS but will lose alot of soldiers in the process. Tech acquired from the Enclave will help supply some the new recruits andup grade the current BOS roster. But without the ability to manufacture new armor and weapons, they would have to use low end equipment. From what i can tell Gun Runners haven't gone as far as the east coast yet.
Mid-west looks like they would have the best of both worlds, depending on the ending that would have been cannon, but the barnaky ending is different from the rest, so i'm just going to disregard it for now. 2 of the 3 will give them robots, as well as open recruiting and sharing technology. If you choose no robots that the open recruitment to locals and tech from vault 0, which i would think is better the east-coast enclave. but if Mid-west does have robots then they might have Super Mutants ghouls and deathclaws fighting in their ranks. how bad would if be if you were pinned down by a BOS, Super Mutant and a ghoul while a deathclaw tried to flank you and get into melee range to either rip you apart or flush you out so that its squad mates could pick you off. As for the bad and Barnaky ending, you would just face off with Robots and regular BOS, but i would think that the vault 0 robots would out gun a local (east BOS) with maybe upgraded equipment if he was good enough to get those upgrades.