When I found I needed a hoop for a detailed project, I tried plastic hoops, which are easier to clean than wooden hoops, and I still use them with some regularity.
My current favorite hoop is my 3 1/2 inch Westex spring tension hoop. I found it particularly useful when I was stitching the model of the Leaded Window back stitch pattern.
The first few times I used the spring tension hoop, I experienced a little difficulty getting the fabric to go in the hoop. If you find you have the same difficulty, use this step-by-step tutorial for putting fabric in a spring tension hoop for assistance. I suggest that when using any type of hoop, hold the hoop by the tension screw or clamp to prevent floss from catching on it as you stitch.