"Best" is very subjective. In order to steer you the right direction we need to know more about your needs.
What are you looking for in a tent?
How many people do you need to fit in it?
What tents did you use and what did you like/dislike about them?
Does it need to be freestanding, or are you ok relying on staking it out every time?
Do you use trekking poles to hike, and are you OK using them for your shelter?
Do you get up a lot during the night?
Do you like lots of room, or something more cozy?
Are you more interested in comfort and features, or ultimate light weight?
What sort of environments do you camp in? (desert, snow, forrest, etc).
How much rain do you expect to encounter?
Do you need to be able to sit up in it?
Do you have a budget?
There's an old saying: cheap, light, and quality. Pick two.