[q] which 1 is better- battery saver, cache cleaner, antivirus or speed booster?

I have installed 4 Utilities in my device-
1. Clean Master
2. CM Speed Booster
3. CM Antivirus
4. Battery Doctor

I think all of them work same.
(Specially CM Antivirus has cache cleaner, lag detector, speed booster, etc.)
So why do we need to keep all apps?

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