Yes, substrate color is a matter of personal preference, and we all have our different views about which looks better with the plant & fish colors - many 'black' users feel that fish & plant coloration stands out more and that white makes the colors look 'washed out'. I feel completely the opposite - white really pronounces fish & plant colors, whereas black tends to make the fish adopt darker coloration than their natural shades, in compatability with their darker surroundings.
As for sands, 'play' sands are generally grittier and dustier, require a lot of rinsing, and are not dense enough not to free-float into the water column when disturbed, have a tendency to get into filter intakes and clog up impeller assemblies, and will easily get siphoned up when vacuuming.
A good grade of PFS will have none of those negative attributes, and will be easy to maintain & keep clean.
It's also a toss-up, again personal preference, as to whether tan colored sand looks more 'natural' than white or black. (btw- I've never seen or heard of black PFS, but perhaps it is available somewhere.)
That's my .02 for what it's worth.
Some of you may care to have a peek at my low-tech planted discus tank, using white quartz-based silica PFS - and judge whether or not you feel it's too bright, not natural-looking, and washes out fish & plant colors:
http://s1105.photobucket.com/albums/h357/discuspaul/Sept2011