I don't think it matters one iota.
I've done 6000 hours and never written a single take-off or landing time in my logbook, only the total time (plus breakdown eg. night, day, IFR etc.).
And yes, I know the CAA say you should, but I submitted my logbooks to the CAA and they never even queried it, I still got all my licences issued without any problems.
Do what suits you.