Stat Priority as a WHM.

[Viviza]

Ask twenty white mages and you'll get twenty opinions.

"Piety is great because it gives me flexibility to cast more proactively"
"Piety is garbage because any good whm can manage their mp without it"
"Crit is great because it affects all my heals, and a timely crit can save both time and mp"
"Crit is garbage because it's unreliable and overheals wastefully"
"Det is great because it improves all my heals and dps"
"Det is garbage because the improvements are tiny per point"
"Speed is great because it improves PoM and allows me to react faster to unexpected situations"
"Speed is garbage because a decent whm can time their spells without it, and it doesn't help regen"

Personally I'm leaning more towards PIE/SS as time goes on. WHM are limited to one action at a time, and the feel of casts being "snappy" counts for a lot, along with some freedom to throw out some damage, rez, or overhealing without worrying about my mp.

[Grotesque]

Ask twenty white mages and you'll get twenty opinions.

Well people think they have a real manifold choice and discuss forever. However, it boils down to how much Pie you want to stack and put the rest into Det, taking whatever SS or Crit is given to you by your Pie/Det choice.