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Servbots, so that you actually have guards while you are sleeping or doing something that requires focus. However, they have limited killing power and you might have to leave them behind.
Since the goal is survival, not being a killing machine, focus on defense. A lot of the melee weapons are pointless, since you can just attach a bayonet to a gun. But the problem with guns is that 8 seconds of cool down in critical times can really kill you. Light sabre is the worst weapon, since you're not out to kill an elephant, you just want to defend yourself for an extended amount of time.
Bomb bag is very good, since you can use it secure yourself as you sleep.
Monkey staff is the ultimate weapon, Extend it fast enough, and you can use it as a gun with infinite range, ammo, and power. And when extended, you can spin in a circle for huge AOE damage. It can also be used as a ladder.
Gravity gun is great strategically and for setting up blockades, but useless under pressure in an emergency.
If I'm completely alone, I'd go with the servbots, so that I wouldn't become insane due to loneliness and use the Monkey staff as an all purpose tool.
If I go on solo scout/scavenge missions, but have a base to return to, I'd go with the monkey staff and Thor hammer or any of the guns with silencer and bayonet.
If I have a base that I govern and protect, I'd take the gravity gun and web shooter to strategically keep it secure.
If I have a base and I'm sent to destroy a zombie herd, I'd take the Capt America shield Thor hammer or plasma cutter for fast killing and good self defense.