An expansive three dimensional world is just much larger and exciting to explore and build in than a simple two dimensional plane of existence. Plus, the possibilities that have yet to be realized and implemented. I have to give it to Minecraft for those two reasons. Regular people are able to make amazing mods for the game, and I can only imagine what the official dev-team can do if they really put their mind towards making a great product even better (officially).
Terraria does arguably have more things to do, though. You certainly have more weaponry and tools at your disposal (things that are in game without the need for user-made modification), the colours are more varied and the combat feels a tad more rewarding. Development for PC is done at this point, so you can't really look forward to a new experience in the future.
That is to say if you generalize them.
They both set out to accomplish different things while operating on a similar premises.
Terraria does arguably have more things to do, though. You certainly have more weaponry and tools at your disposal (things that are in game without the need for user-made modification), the colours are more varied and the combat feels a tad more rewarding. Development for PC is done at this point, so you can't really look forward to a new experience in the future.
That is to say if you generalize them.
They both set out to accomplish different things while operating on a similar premises.