A stove is a working unit not an ornament.
Your burning fuel in it, which varies in levels of dirt.
Any stove gets dirty.
They are supposed to be dirty.
If the worry of constantly cleaning it is affecting your choice of colour - get a black one.
Cream is the worst colour for a stove if the apperance of it will bother you that much.
I suppose it's like wearing a cream shirt playing rugby.
p.s. I have a black one.
I thought about a cream one, but for all the reasons outlined above went for a black one. I love it, and thank those advisers every time I run a cloth over it and it comes away black as....well soot.
I have a green one. No obvious dirt. If I was choosing again I probably would get a cream one or a black one. Green is more or less banned in our house now.