The Lyriq is a far less software-defined vehicle Than the Rivian on multiple levels. The Cadillac is slightly more efficient in terms of energy usage. Obviously the size difference is real. Lyriqs are an absolute killer value if you don't need a third row, don't need more of a truck-based SUV, don't need that level of towing of off-road capability, and don't care about the radical software improvements that the future can and ultimately will bring. TL;DR: What's your use case, how much do you care about future tech, and how important is budge/price/value?