Back to the original question. I think part has been answered but part is still open.
As previously mentioned your distance to customers is most important. Of course customers are likely to work with satellites closest to them. So there is a relationship there. It’s important to know though that satellites do not select nodes close to them, but rather a random set of good nodes all across the world. So your node will at least start uploads from all over the world. These uploads (as well as downloads) are overprovisioned. So when enough pieces are uploaded, the rest are canceled. And that’s where you might see an impact. If your node is slower on average to finish uploads, you may see more canceled uploads. Luckily I (together with a few others) created an easy script that you can let loose on your node to find out what percentage of transfers is canceled. You can find that script here: