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F-Droid Classic - clean and slim
(f-droid.org)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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F-Droid Classic can automatically download new Updates. And if it has root access, then automatic installation of these Updates should be possible. Since I have not rooted my phone I cannot confirm if this is working.
The advantage for me personally is, that the User Interface is very easy and use. This gives me time back when I am searching apps or doing manual updates.