@luverlybubberly re suggesting oils, we went to the Neom shop so we could sniff them in person which is the best way to choose what you like. The shop smelled heavenly and we bought 5 oil blends.
Our favourite is in the calm and relax range and is Moment of Calm (rose and neroli) it is our go to. The others were Sensuous, Complete Bliss, Feel Good Vibes and the most expensive one was Ylang Ylang, Vetivert and Tonka Bean, which was £30, the others were £20 each.
I have two cheap Amazon diffusers. The Neom oils are very rich in quality and so they can feel overpowering scent wise if you put too many drops in. I tend to put mine on intermittent if the continuous mode is too much.
Diffusers are also about how they look, they all perform roughly the same way, some may have timers for different lengths of on time.
@Wallywobbles Lots of essential oils are not good for dogs so I am not surprised your poor dog got sick. There are pure essential oils plus blends of essential oils however there are also synthetic ones that people use too. I wouldn't want to be inhaling that never mind a poor dog whose sense of smell is far greater than a human.