Marky, I'd definitely recommend Terraria.
The building IMO is better than Minecraft since blocks are smaller, everything in minecraft just looks rubbish to me because of how big the blocks are
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, stuff that you build actually looks cool in Terraria, obviously it's 2D only though.
However the main difference between them is Terraria actually has proper progression when it comes to armor/weapons and a decent amount of bosses to progress through using the armor and weapons.
I've spent over 500 hours on it and I don't really care much about building, just progressing through with different types of character.
They just added a new patch as well that I haven't tried yet (since I'm not too bothered about building) adding a load of stuff based around the wire system like AND/OR switches and stuff if you like that kind of thing.