Need Grill advice for pontoon?

My husband wants a grill for our new Bently pontoon - its 24 foot if that even matters. I'm pretty sure he wants one that mounts to the rail of the boat. I have found a couple that vary greatly in price. Assuming that I an afford an expensive one - does anyone have any advice to give me on which brands and kinds are better? I dont have a boats world or anything nearby so I will need to order online.