While they both have mounts for tailights, unlike the MEC one, the Tubus rack uses only the European standard. That's usually not a problem though, you can get or make an adapter. Some tail lights even come with an accessory so that you can use either mount. Though, that is not my favorite way of putting a light on the rack. I like to bolt it directly to the mount.

I also agree with what fietsbob says about durability. The Tubus brand is very good. They have a 30 year warranty on their racks. I own both a Tubus Cargo and a Topeak Explorer. Not the same as the ones you listed, but close enough. I have used the Topeak on my commuter/grocery bike for the last four years without a problem. The Tubus is rated at a higher load, but I havee had a lot on my Topeak (food for me and a 20lb bag of food for the dog.) The Tubus is on the tourer/part-time commuter. The weight capacity won't really matter for you, but it is nice to know you can carry more if needed.

I agree with voj112 that for your stated purpose, you could go with less, like the Tubus Vega. It will weigh less but still plenty strong.

If I could only have one rack, it would be the Tubus Cargo.