IMO if weight and a months worth of battery if not the main concern then I would go SRAM ETAP AXS since it's truly wireless which makes it easier to install and service, the app is really good, costs less, availability for parts is better, and IMO is simply designed better IE little things like a cassette simply being one piece and simply threads on the hub. Shimano is great stuff but what's the point of going electronic if your Shimano RD still has a snagable wire attached to it?