Which is the best according to your view? The cultivation of herbs is beneficial However, you could allow it to OSRS Gold go for a bit. But I wouldn't consider it the sole thing to consider: just don't ignore it. Learn how to farm and level it up gradually. By the time you're at level 30/35, it's likely that you' be able to make some pretty regular money from it.
The Slayer may not be worth the effort to power train yet. Start it...