ataidle vs smartctl for spindown

After playing around with Freenas, I've come to the conclusion that I would like to spindown in evening only i.e. when people are also asleep. So I thought I'd just put a script in cron to kick the drives into spindown say midnight or something like that. I don't think spinning down once a day is going to reduce the life too much (as opposed to setting a timer, and having it do it a many times a day).

However I realise I can do it via ataidle or smartctl. Is there any difference or...

ataidle vs smartctl for spindown