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Was it an 8 year old e6000? Anything from shimano newer than that is massively nicer.
Do get a lot of feedback from folks with bosch that.. Whilst sometimes they have higher peak torque, unless you put an aftermarket map on it, the bosch gen 3 mostly don't offer that full torque to you unless you are standing up on the pedals pretty much. Whereas shimano when set to boost /turbo, gives all it can pretty much all the time. So quite a difference.
In gen 4 bosch though they are very very similar. Would basically not worry between an ep8 or a gen 4 cx/cargo, would have to be on a dyno to tell the difference.
Try some out even if you don't plan on buying new. I was pretty disappointed with the shimano systems we tried, Bosch felt much more refined. Easy to chip too, if you're going on holiday to the US: https://www.ebiketuning.com/speedchip-v3-for-bosch.html