Well, that’s a tricky question, because it assumes a lot of things.

But, which is easier: spotting a thing close to you with both eyes as it’s in the sky; or a thing far away you can only see with one eye that can only see in a narrow section of the sky at one time?

Spotting something via telescope, particularly if it’s moving fast-ish, isn’t easy. It can be hard to point binoculars right at a bird a few hundred feet away, even when you know where the bird is and it’s still.

On the scale of things, spotting a random UFO in the sky that’s not close enough to see without magnification is like trying to find a single heart shaped blob on a Jackson Pollack painting that’s across the room. You look up at the night sky, a ufo would have to be moving fast to pick it out from stars. So you’d have to get lucky to have it pass in front of your scope, or be pretty quick to lock onto it with the scope if you saw it moving with the naked eye first.

In the daylight, if it isn’t close enough to see with the naked eye to some degree, you probably won’t point a telescope at it to begin with.