I know that for my use-cases, having both options available would be very appreciated. The vast majority of the computed columns I would use in my database would be okay to compute on read. But there are for sure some which would be performance prohibitive to have compute on read, so i'd rather have those stored.
So for me, i'd rather default to compute on read, as long storing the pre-computed value is an option when necessary.
Just my $0.02
Thanks,
-Adam