I'm recommending Towny over the claim plugin cause for starters monsters don't spawn inside of a town. Its easier to use with a clearer idea and you don't require items to use the commands. Towny works with the dynmap as well so its no real loss and on top of that you can spawn into other people's towns by typing /t spawn [town]. But it will still protect the areas that are claimed from outside use. You may need to adjust the towny settings if you were to use it cause it defaults with charging people to make towns and that should be a free feature in my opinion. You can also reward extra towny blocks to those who donate and vote so that way it will encourage donations and votes. Personally all in all I think towny would be more valuable of a plugin just cause overall it does the same thing but as I said it stops monsters from spawning in town.