If your Object is not to complex then its better to use 1 UV Texture with a size of 1024 Pixels.
The more Textures and the bigger they are the more needs the Game/Engine to Load and this pushed up the Loading times.
Out of my sight i try every time to use as less Textures as possible with a Size of 1024 Pixels.
It is important for modelling objects.
At RCT3 times my textures wasn't higher than 256.
When my model gets 4 textures in the Size of it, Maybe ist better to make One texture in 512 or 1024.
I don't want to do useless Space of the Game engine.