Depends! I'm not looking for an answer but here's some questions to help you decide: do you orgasm more from clitoral stimulation or vaginal? Is there something you prefer as far as stimulation?

Vibrators are nice, but there's different kinds. I recommend an adjustable speed (there's buttons with set speeds or dials work gradual acceleration). Stag shops will usually have cheap ones that work really well for first timers.

Dildos come in all shapes and sizes, including more....niche ones. If you're nervous or shy, start out small and work your way up. These can also come with vibration.

There's also Rabbits which stimulate both simultaneously. And I can't remember the name but women swear by that one that, um, sucks (no, literally).