Yes to all three questions.
The PC version of Minecraft is much more developed than the PS3 version. (Note, NOT the Windows 10 specific version, which is Pocket Minecraft, but the original Minecraft)
The worlds of PC Minecraft are -almost- infinite. The PS3 version is a square 864x864 blocks large. The PC version is 29,999,984x29,999,984, so it is a -bit- bigger. (sarcasm).
It has additional biomes and at least a few extra blocks.
More importantly for creative types, -IF- your PC can handle it, PC Minecraft has mods. This can add millions and millions of new options to Minecraft.
For you I highly recommend two different mods. Chisel allows you to apply different appearances to each block. This means you go from one look for Cobblestone, for instance, to twenty different kinds. (The Chisel blocks don't naturally spawn in, except maybe in other mods' structures.)
There's also Chisel and Bits. It is a separate mod, but it allows you to break every individual block into Minecraft into its basic components. This allows near infinite customization.
And there are more mods, such as Natura of Biomes a Plenty which add even more options. The number and success of mods you can run depends on your PC's hardware and software.