Net choice depends on where & what you're trying to net.
A small lightweight net designed for finger Mullets close to the bank, in shallow water.
Will never work on Pogeys the size of flip flops in 10' plus of water.
It won't sink or close fast enough to catch bait.
Best all round net should be something you can handle, from a boat, a dock or standing in the surf.
Remember you're going to be making more than a few throws.
7 or 8 footer with medium mesh size, a fast sink rate should cover most of your needs.
Some good reading material from Calusa ( a little pricey ).
Hope this helps. ........ ICM
http://calusa.com/categories/cast_nets_calusa.html