If I get a display cabinet tower, I'll probably get the fantastic furniture one (as it can apparently hold more weight) and that lock.
But then I'd have to spend more money. It's a tough call to be honest. The cube might be more durable due to having toughened glass, but a tower would look better and hold more items.
I also only really have 40 cm of space left in my room: 44cm if I put my rolled up posters elsewhere and move my shelving unit 4cm.
If I just get the cube I can put it on top of the shelving unit, but there's always be the chance it'd fall. If I get the tower, it'll have the benefits I mentioned above, but might be less durable and cause me to spend more than I have to.