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The top one Pip. Ours is poly plastic and that one appears to be metal, but that isn't a problem; our first one was sheet metal and I thought it would rust out but it lasted for about 15 years. The one in the lower picture would be more work to empty as you can't get your wheelbarrow under it.
From my experience, people who say they don't work don't understand how to use them. The thing you don't do is just keep adding stuff to it. The correct way to use them is to do your pruning and lawn mowing at all more or less at the same time. We munch our prunings which speeds the process somewhat. You don't want a very dry or very wet mix. Lawn clippings are good, but you need other stuff with it as clippings on their own clump together and you don't get the air circulation you need. We use no more than half full of grass clippings and the rest munched or cut up prunings, maybe a bit of sawdust or shredded newspaper and a small quantity of some manure of some sort, natural or artificial to act as a starter. If you have comfrey that is a good starter too. With each subsequent batch leave a little of the old batch behind as that helps get the new batch going as well. Kitchen scraps of course are also good. You can add more while the mix is still hot, a few days at most. Give the drum about five rotations once a day to start with. Later in the cycle once every second day seems enough. But don't add more material. You should have good compost ready to use in a fortnight or so.