Things may have changed, but I had heard (from a bike shop) that Bosch support was very poor, whereas Shimano is (globally) pretty reliable.
Also Shimano makes bike parts. Which I like
@Dammit started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
Hulsroy
@Dammit
Things may have changed, but I had heard (from a bike shop) that Bosch support was very poor, whereas Shimano is (globally) pretty reliable.