So if I understand correctly, if bearing size is the same, I shouldn't bother, but if they use larger ball bearings for the ACB, then they are worth going for?
Not sure whether you deserve sympathy or mockery, I suppose it depends on whether you bought the bike or had it given to you. Notwithstanding that, radial bearing cartridges are not where the problem lies with BB86, so I wouldn't spend extra to get ACB.
Shame on me for thinking a top end bike (Canyon Aeroad 2016) would have a well thought out BB system. I'm going for a threaded together BB to hopefully make the most of a bad situation.
For a BB86 in my case, a 24mm spindle.
So if I understand correctly, if bearing size is the same, I shouldn't bother, but if they use larger ball bearings for the ACB, then they are worth going for?