Looks:
-Small:For 100 currants more, you can get a pretty looking colors the Big Bags don't provide.
-Big: For the same price you get the same generic color.
Worth/Usage:
-Small: Good for putting things you keep on your floor, into one bag. Why? It has 10 slots, so two of those bags beat having a one Big Bag with 4 less slots. Since it'll be in your house you don't have to worry about having to many small bags. (Cost is 900-1000)
-Big: Even though it is worth less than a Small Bag, it is the only choice you have when it comes to carrying stuff on ya at all times. It's better to have two slots that can expand to 32 more slots, than rather two slots that only go to 20. As you play the game, the price pays off. (Cost is 1999)
Toolboxes are great to put all of your tools in unfortunately, like a Cubimal case, things you pickup won't automatically go into that box (Unless it's in the front).