There is more to birding binoculars
than just the specs. You also have to consider optical
and mechanical quality and subjective factors such as handling - that can be quite important if you bird for long periods at a time. Then, too, even within a single brand like Leupold
, there is quite a difference in optical
and mechanical quality, depending on the model you choose and you did not specify a model. I am not familiar with Esky, however.
If we only consider the specs you have provided, the only significant difference is in the field of view. If you are a beginning or even intermediate birder doing close range work on warblers and other song birds, the wider field of view of the Esky is an advantage. If you have been using binoculars
for a long time or you are typically doing mid-range or long range work on birds, field of view is less an issue.