It's interesting, becusee I moved from FTTC getting 100/40 to HFC and still getting 100/40.
Each technology has their own hardware faults though, and I've witnessed both. But as a user of the service, I'm actually surprised how decent HFC has been working.
My parents of FTTN get about 50/20,which is what I expect a lot of users on these lines would only be able to access. But the sheer cost of using a NBN over 4G makes it a lot easier to sell, data sims are not cheap