Both have about the same quality.
The first was a low budget movie. (Fist)
The second was a bigger production, by european standards. (few)
It was when they shoot (TGTBTU) they got funding from an american company and it had the resources it needed. I would say qualitywise a few dollars more would be in the same leauge aswell.
I agree the once upon a time is a great movie. The only problem I cant wait for them to reach the excellent final.