I have both, and like most Lelo products, they're both amazing. I prefer dual stimulation, so I'd pick the Ina if I had to choose just one. The Mona has its own advantages, though. The size of the Mona fills me quite well, and it stimulates the g-spot without any effort on my part. I can just find a setting I like and leave it in place while using a different toy--or a partner--for clitoral stimulation. If you need clitoral stimulation and can only indulge in one, go with the Ina. If you have the luxury to get both, I think the cost is justified by having more flexibility of use in one of the best g-spot designs available.