Paper aesthetics notwithstanding, when compared with other papers using a (non-subjective) checklist; dmax, gamut, gloss differential, longevity, weight, suitability to the printer & inkset, manufacturing quality (44" resolved), sizes, availability, etc... the measurable specs on HP Professional Satin and HP Premium ID (Instant Dry) Satin (same surface, Pro. is heavier of the two), puts them at the top of my paper recommendation for the Z3100.
There are a number of us who have dialed-in on the HP Satin; in communication with Jon Smith, Jon works with respected printer/photographer Joel Meyerowitz, after exhaustive testing Joel uses only this paper on his Z3100 for the reasons listed above.
I'll leave recommendation on Fine Art Paper to others.