Which is better for charging two devices at once?

The Ugreen Nexode 35W. It has two USB ports, while the Anker 323 has only one USB-C port.

Which one is better for travel?

The Ugreen, because its prongs fold away. The Anker 323 handles 100-240V input, which suits outlets in most countries, but its prongs stay out.

Do I need to buy a cable for either one?

Only for the Ugreen. The Anker 323 comes with a 6 ft USB-C to USB-C cable; the Ugreen ships without one.

Which has better safety features?

The Anker 323 lists its MultiProtect safety system. The Ugreen does not name a comparable protection system.

Is the Anker 323 worth stepping up to over the Ugreen?

Only if you want the included cable and a named safety system. The Ugreen wins on ports and travel design for most shoppers.

Which is more reliable?

The Anker 323's 3.6 out of 5 from about 1,100 ratings is mixed. The Ugreen has no rating shown here, so read recent owner comments on both before deciding.

Ugreen Nexode 35W USB-C Charger vs Anker 323 Charger

The Ugreen Nexode 35W is the better pick for most people. It gives you two ports, so you can charge a phone and earbuds at once, and its foldable prongs make it easier to carry. The Anker 323 is a single-port charger, but it includes a 6 ft USB-C to USB-C cable and Anker's MultiProtect safety system. Anker's 3.6 out of 5 from about 1,100 ratings is middling, so check recent owner comments on build and reliability before you commit.

Choose the Ugreen Nexode 35W if you want to charge two devices at once and prefer a compact charger with foldable prongs for travel.
Choose the Anker 323 if you need just one USB-C port and want a long USB-C cable in the box.

Prices

Ugreen Nexode 35W USB-C Charger: $18.99 at us.ugreen.com (checked today)
Anker 323 Charger: $18.99 at Amazon (checked today)
Difference: both cost the same today