Sending luggage from Spain to US

I’m a student and I need to send some luggage home to the US from Spain in a couple weeks. I’ll be doing about a week of backpacking in Europe after my semester is over, so timing isn’t necessarily my first concern, but I want to pick the most reliable company. I’ve seen SendMyBag and DHL as top options, but I would love input. Are either of these a clearly better option? Is there any other company that might be better?