We've got a 60L Engel fridge in our camper, which we sometimes use in the tub of the covered ute. A mate of mine has a 65L CFX Waeco, and it is excellent from what I've seen of it in direct comparison on the same trips, for less $$.
If we had our time again now, we might have got 2x 40L CFX's, giving us the option to have one as fridge, one freezer, for not much more $$. The CFX's weren't out when we got the Engel. We will get a 2nd fridge down the track to put in the back of the 4WD, and it will be a CFX.
Also consider the height of anything you get. Will it fit where you want it to go, and will it fit the things inside it that you expect to want to have standing up. Example: I can't fit some wine bottles upright in our 60L Engel, and it's a pain. Just think it through and take a tape measure..