Lots of other factors I'd take into account, but I would be tempted to get 10 clones that someone has hunted through to find a decent pheno that has characteristics you/the market are after.
Seeds are often not stable, so you can end up with a few different phenos, some might be great and some might be average.
Seed : The cost is more, will be longer grow and your flower could vary from plant to plant.
Clone: The cost is less, faster turn around and plants will all produce the same flower.
It always depends on what you are trying to achieve though.