The A1 and X1C share the same build volume and top speed, but that's where the similarity ends. The X1C is a production-class machine with an enclosure, Lidar, and AI sensors. The A1 is a capable open printer for everyday PLA work.
If you're comparing these two, you probably don't need the X1C. Most people who buy the X1C for hobby use could have gotten exactly the same results from a P2S at half the price. The X1C earns its keep in small business, engineering, or farm settings.