i’ve used plenty of nets, but, i’ve never bought my own, nor noted the brands of the ones i was using. (i bet a lot the ones i’ve used came from BioQuip, but that company no longer exists, and i’m not sure which net supplier they used or if they had their own line of nets.)
as noted before, the best for you comes down a lot to personal preference and specific task.
here are some from science suppliers that look reasonable. the advantage of ordering these is that most of them seem to have replaceable / interchangeable parts so that you can adapt for fix your net (until the manufacturer goes out of business, i suppose):
- https://www.wardsci.com/store/product?keyword=nets, https://www.wardsci.com/store/catalog/product.jsp?product_id=24271830
- https://www.educationalscience.com/butterfly-nets
and, honestly, some of the ones on Amazon look fine (and cheaper), too, though its unclear if these can be mixed / fixed (if that’s something that appeals to you):