Both will be happy in S/H They are both hybrids that are wet growing and sitting them in water is also possible. I haven't tried S/H before but I sit mine in clean and clear water. I notice some roots actually grow into the water!
The phrag. Les Dirouilles may not be getting enough moisture in the medium mix because it is a seedling. Maybe sitting this one in water or changing it to S/H will be better.
Just think wet because the are rainforest bog plants...water everyday or sit in shallow clean water or use S/H or use moist sphag moss
How are you watering them right now?