I recommend s/h with a seedling mat.
I have had a horrendous time with phals!
My humidity is low and difficult to control in my house where I currently have my phal. (40%)
Township dictatorships have my greenhouse "on hold"
The periodic wetting and over drying of phal roots is the most common cause for their demise in any home...making the roots susceptible to disease etc...other than overwetting if not repotted soon enough from compacted sphag moss.
s/h enables the roots to breath appropriately with great humidity especially with the seeding mat.
I have renewed confidence with 15 plants flourishing currently