Comparison
The Celestron NexStar 5SE is the clear winner for most amateur astronomers. While the NexStar 6SE offers a larger 150mm aperture, it sacrifices the portability and ease of use that make these compact GoTo scopes attractive in the first place. The 5SE's superior beginner score of 53 versus 43 reflects its more manageable learning curve, and its 7.98kg weight makes it genuinely transportable to dark sites, whereas the 6SE's 19kg bulk negates much of the convenience that GoTo mounts provide.
The single most important differentiator is portability. The 5SE weighs less than half what the 6SE does, transforming it from theoretical asset to practical tool you'll actually transport regularly. The NexStar 5SE suits observers who value accessibility and willingness to transport their scope; buy it if you'll actually take it somewhere.
The NexStar 6SE appeals to stationary observers with permanent setups who want maximum light gathering despite the weight penalty. Choose the Celestron NexStar 5SE unless you have a dedicated observing location where portability is irrelevant. For most amateur astronomers, the 5SE's combination of manageable size, solid optics, and GoTo convenience represents better value.
Why choose Celestron NexStar 5SE
Why choose Celestron NexStar 6SE