I say go with the Tubus Cargo. It may be overkill for some of your scenarios but that's not a bad thing for an additional 4 ounces over the Vega. You'll not have to worry loading up with groceries. Tubus steel is pricey but definitely no nonsense rugged. I don't have any experience with the Madison Summit, but have used other aluminum racks that were flimsy when loaded up.