I've tried them both and both have helped though I tend to have problems getting to sleep if anything. I find the night ones don't knock me out but help me to relax though I do find it harder to get going in the mornings and I'm quite a morning person.
Some mediation classes helped me with that - I find it really hard to switch off, even when relaxing but that helped me focus more on it and give me techniques to relax myself.
I find getting into a routine helps as my body knows it's time to switch off and sleep. I can't be too hot either, always have a window open and have a dehumidifier that blows cool on me I have set on timer to switch off after and hour. If I have a bath I can't sleep as baths make me too hot.
Similarly I can't sleep on my back, have to turn on my side. Probably, annoyingly, psychological but it works for me.