I have tried both the regular and the HERS Chamois Butt'r but NOT the Eurostyle Butt'r.
I personally like the HERS Chamois Butt'r better because it seems a tiny bit thicker which seems to make it last longer on my body/chamois pad.
No difference in my groin region regarding the pH balance of the HERS Butt'r vs the regular one from what I can tell.
2014 Liv Lust
2013 Specialized Fate Expert with carbon wheelset (sold)
2012 Specialized Amira Elite
2010 Santa Cruz Juliana with R kit and Crampon pedals (sold)
2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle (sold)