Canyon aeroad ultegra di2 vs sram force etap. Which would u choose?

Hey guys, just want to know your opinion which bike you would choose:

https://www.canyon.com/de-de/rennrad/aero-rennrad/aeroad/cf-slx/aeroad-cf-slx-8-di2/3965.html?dwvar_3965_pv_rahmenfarbe=R107_P01

or

https://www.canyon.com/de-de/rennrad/aero-rennrad/aeroad/cf-slx/aeroad-cf-slx-8-axs/3966.html?dwvar_3966_pv_rahmenfarbe=R107_P01

500€ price difference and 400 grams...