Some people(including myself xD) don't know if they should max holy spirit or keep it at level 1, so I tried lvl 1 holy spirit, I wuv it :3
Max - Good if you actually dont know how to start a combo outside of random casts of this. It does a lot of damage when you spam it, but your MP tends to blow off. That means when you have very low HP, you'd usually have enough mp for 1 more skill like 1 sacred wave or light of healing. Of course when you need to holyspirit--->LoH that doesnt work, since that spends a lotta mp.
Lvl 1 - Good when you actually know how to make long combos. Why is this? This is because decayed maxed holy spirit = useless waste of MP. At least with level 1 you are just extending it. With level 1, you can actually use it outside of attacking to get the first hit more easily. Random moon pieces + holy spirit in 2 different directions = much easier first hit. You couldn't do this with high level holy spirits because you'd be spending a lot of MP.
I could also take this topic to max tears vs lvl 1
Max tears - It does very good damage which is why people love it and suggest that it is a must max for all builds unless your a hardcore FS build(but this is about PvP not stage isn't it?;o). Thing is, stage = monsters are stupid. PvP = Anyone can dodge the actually part of tears that does big damage. What are the odds of you getting tears to hit non-decayed from random point blanks? Very low, unless you sleep bind.
Lvl 1 - I prefer 1 as it's a sniping skill used to extend combos and 0 hp people who dont want to die(Seriously, there are times when I needed to kill a tia but kept running around, a tears could have done the job BUT NO, max tears = makes you think you'd waste it if it missed.)
My take AFTER the 5-28-09 Patch
Max please, these days the healing is really not worth it so you might as well do as much damage as you can. Its easy to land also. AASAA dash space holy spirit ftw. The reason why people liked lvl 1 in the past was because it spent little MP and matches were long enough for MP saving to really matter. With light of healing being horrible, feels like level 1 has became obsolete.
Tears of Goddess