I like the wooden ones...but then,that is the only kind I have had.

Wood.
Things fall through the wires.

Thanks Phoggie and a2gemini, I also thought about things falling thru wires but because these are base cabinets and only holding pots, pans and casserole dishes I started to think that would not be a problem. anyone else have preferences

I am shamelessly bumping my own post because I would really like more opinions.
I hope I am allowed to do this.

2 brands are hafele and rev a shelf...the websites containerstore.com or stacks and stacks.com offer a variety of items-good to browse through their kitchen pantry/drawer/ and cabinet options. I have ordered from container store-efficient and no hassles.

I have wood pull-out drawers in my pantry. I have the wire baskets under my sink. I would prefer wire. I notice the wood drawers collect all kinds of things: dust and dirt that flies around and collects in the corners. I would prefer that the dust and dirt fall through the holes of the wire racks and settle at the bottom of the cabinet, underneath the pots and pans, hidden away..... : )

Also, if the pots/pans are, for some reason, slightly damp when put away, they would more easily air dry sitting on a wire rack rather than a piece of wood.

What would you be storing in that space anyway that would be small enough to fall through the holes? I definitely think the wire racks make more sense.

I would go with wood. When I did mine because of the odd sizes of cabinets, it was cost/space efficent to have someone make them. Am sure you will enjoy them.

We had retro-fitted wooden slide-out shelves in our lower cabinets in our last kitchen. They weren't as good as drawers, but way better than fixed shelves. If I were doing it again, I might go with this sort of thing instead:

We have 3 of the Elfa mesh baskets in our closet that we use for laundry and like them a lot, although ours are part of a whole Elfa closet system. The wire baskets might be better for pots and pans. Those baskets also come in small, med., large referring to the depth, depending on what you want to put in there. I'm not saying don't do wooden shelves, just that these are well made and easy to install. If the pre-made sizes don't work for you though, you might as well hire someone to come in and make shelves for your particular cabinets.

Here is a link that might be useful: The Container Store