Is it better to have my ends loose and wispy OR rounded and blunted?

Neither is inherently better or worse than the other. Ultimately it comes down to a matter of personal, aesthetic preference.

PicMonkey Collage

Same set of dreadlocks with rounded ends (left) and loose, wispy ends (right).

Many folks believe (correctly) that having loose, wispy ends help facilitate faster, more efficient drying time after washing.

However, as long as you are using the right products in  your locks, this shouldn’t be a concern. It’s if you are using the wrong kind of shampoo or putting wax in your locks that the slight amount of additional moisture retention that’s associated with rounded tips can become a problem. As long as you are caring for your locks properly, both rounded OR wispy ends are good, valid choices.