There are three kinds of table tops for your home or shop workbench, each with some specific functions for use.
Metal
These table tops typically only go with metal frame workbench set-ups. They are welded or bolted on and made of stainless steel. They are rarely the go-to option for anyone who works with wood. However if you need something that won't stain and is a snap to clean, this is perfect for you.
Laminate
Table tops with a laminate coating, also known as Formica, are terrific if you want to choose what color the table top will be. Formica comes in a whole host of styles and a wheel of colors. It is smooth, easy to clean, but will stain if a caustic substance is left on the surface too long. The laminate is a thin piece of plastic, surrounding most often a particle board interior. It is hardened and can take a beating.
Wood
Wood table tops, usually maple, are great for many projects, but have the flaw that it will tell all of your abuses. If you are rough on it, stab it, saw it, stain it, or otherwise damage it, everything that has been done to it will show. No one wants to ding up their work space, but accidents happen, things get spilled, and the consequence is a large wooden record of the trials and successes, or failures, of your many undertakings.
If you intend to be rough on your workbench table top, a removable particle board top is a great idea. Particle board is basically compressed sawdust, held in place with glue. You can dig it, dent it, drill into it, spill glue on it, drip paint on it, and, when you've decided it is beyond saving, throw it out and replace it. Cheap and easy.