they will give the same results both good brands, check the price and availability and go with whichever you get cheaper/quicker. If your going to be using large doses obviously go with the more concentrated ttokkyo boldenone.
I have had great results with both Ultragan 100 and Boldenon 200. But I would go with the Boldenon because it is 200mg/ml instead of 100, hence less injections, especially since you're probably stacking it with something else. The only difference that I noticed that Ultragan gave me ackne and Boldenon didn't.