If vibration has never done much for you: this is the category worth trying next. It is a different input, not a stronger one, and that switch works far more often than buying a more powerful vibrator does.
If your first one disappointed you: check the seal before you blame the toy. The mouth has to sit around the clitoris rather than on it. Almost nothing happens without that seal, and most people get it wrong the first few times.
If you are buying your first: start at the cheaper end. Fit decides whether this works for you, and fit is not something you can read off a box. Find that out on something inexpensive before you spend serious money on it.
If you want to move around while you use it: finger-sized. Keeping a seal with a handle takes concentration. Keeping one with your fingertip is close to automatic.
If penetration matters too: a dual model. Air pulse outside with a curved arm inside covers the whole thing, and the G-spot vibrators page has the rest of that shape.
Still weighing it up: air pulse vs vibration walks through which one suits which body, and where the split really comes from.
On lube and cleaning: a drop inside the mouth, and rinse it after. A little water based lube improves the seal considerably. The mouth is the part that collects, so a toy cleaner and a proper dry matter more here than on a solid toy.
