If you are new to this game and you are going to clear the campaign, I would suggest you to get those bundles to support the development team. You get the extra maps and with the club membership you get one extra item with the same rarity as well. What if you have some pizza remaining? Save them till you have 80 pizza for one week club membership. Then when you see a legendary treasure/useful legendary item in club reward, buy the club membership immediately so you can unlock the legendary treasure/item. It is much better than buying chests directly as you know what you will get in this way.