I think bloodline sounds better. Bloodlines also tend to be more powerful than gifts or traits unless the bloodline is trash.
The main reason is that it sound cooler though.
There are a lot of grammar mistakes in the first chapter.
For example, "An atrocity and abomination occurred in the city of Loz, more precisely the tavern Moondust."
The line
"An atrocity and abomination occurred in the city of Loz, more precisely the tavern Moondust."
should be changed to...