openSUSE is a great and very mature choice. Check the Gecko variant if you want something perhaps more suitable for a first time user.
There are varying levels of security, but still every linux distribution is pretty secure.
The main difference though is the desktop environment you choose. MATE is a good balance of everything, KDE if you are used to Windows look and feel, Gnome if you are after the smartphone look, Cinnamon is pleasant like eye candy, XFCE is minimalist. There are a few others as well but these are the basic choices.
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