Ive never had androids brain sucked. I also havent ever had androids requiring medi-kits. Either they dont need medkits or for some strange reason they never receive critical damage and can be killed without it.
Also androids are useful no matter where you are in the game. Early on they are easily your best agents against both aliens and raiding, midgame they make great sentries for research/manufacture/storage/vehicle bases, mid-game and end-game they are easily your best Heavy Weapons Agents as they can be fully loaded with heavy items yet still run faster then your human agents and when I mean heavy weapons im talking about missile launchers which dont require a great deal of accuracy.
Also Solmine give a lot of elerium
Honestly instead of corps you can be hostile with there is really a shorter list of corps you cant be hostile with. These corps are....
MegaPol - Police Cars shooting at your vehicles constantly is not good when trying to fight aliens. Also not being able to procure vehicle equipment.
Goverment - Unless you somehow are able to fund yourself the goverment should not be made hostile with or you will lose a lot of funding.
Marsec - Cant buy thier guns, armour and ammo, more importantly you cannot buy thier vehicles or equipment and you cannot get the latter two from raiding unlike the former three.
Transtellar - Cant transfer anything except vehicles between bases, also cannot get scientists/engineers to bases, although the Space Port is a goldmine for raiders.
Super Dynamics - You cant buy or loot fuel or engines which can force you to have to use the people tubes to get to aliens, and the only equipment you can get as loot is the equipment your agents manually pick up from the battlescene.
Some of the other corps are pointless to raid, although Solmine are a great way of getting elerium, and nanotech if for some reason medkits are becoming scarce.