i should mention that i'm also not from the US and the ubiquity of black xs or fierce is very much unkown to me..
Black XS - by default
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Black xs is similar to allure hommes base and Versace fraiche but strawberry is the scent instead of citruses.
Fierce is sweet citrusy and musky.
Only know of the two
black xs is a synthetic strawberry version of versace fraiche
Definitely Black XS from your choices. (I think Black XS & 1 Million are both excellent releases from Paco Rabanne. I also like the original XS as well).
synthetic is not always bad though. Nautica voyage is synthetic as hell but its one of my favs. Black xs to me is okay though, i do have a bottle but am not crazy about it.
i have both fierce and black xs and i love black xs alot more because it gets alot of compliments and is pretty rare in america. also, 2-3 sprays will have you covered for many hours
Black XS by Paco Rabanne - This wonderfully exotic fragrance opens with a citrus duet of lemon and kalamanzi, commingling with sage and tagete. I am not quite sure if the spice and marigolds work on the citrus, but a tangy stawberry becomes sensorially incarnate. The sweet heart with its cinnamon, black cardamom, tolu balm and praline wrests control of this pseudo-strawberry, and excises the bitterness yielding a dark, sweet and spicy concoction. The eager base, with its woods and amber, as well as its hint of patchouli, evicts the fruitiness, and forms a warm and inviting drydown. The longevity for this daring fragrance is good, while its projection is average for a close to the skin scent.