This is a bit hard to answer without any context, but I'll try my best. As far as I can tell, we use whichever preposition we would normally use.
"It may be easy for you, but for me, it's hard." ("It's hard for me.")
"He thinks it's fun, but to me, it seems stupid." ("It seems stupid to me.")
"She's nice in his presence, but around me, she's mean." ("She's mean around me.")
I hope I answered your question correctly. :)