Consider the following when you pick a dildo or other sex toy

Area of
penetration/stimulation - anal, vaginal, g-spot, clitoral.

What size - Is it pocket size? just right or is it going to be a huge gag gift?

Where and how you will use it -
Solo, with a friend, in a group or in water.

Where will you
use it - Does it matter how much noise it makes.

What material do I prefer - Plastic, Silicone, Rubber, Latex, Jelly, Metal, Cyberskin, Glass

What lubrication you prefer - oils, gels,
lubes

How easy will it be to care for your
toy

The main thing is that it should feel comfortable in your hands, be pleasing to your eye and not slip from your grip