Hola Juan,

if you want a charger out of these two I would take the schulze. I had never a problem with a schulze charger (ISL6-430d and Ultra Duo Plus II). And the new 330d is a modified Graupner Ultra Duo Plus II and seems to be absolutely reliable (some friends of mine are using it). I also used a 240V power supply for all my chargers without any problems over the years. But consider Orbit. The Orbit microlader V6 could be an alternative (maybe it is a little bit higher in price). Orbits have got the advantage of the Reflexcharging to avoid memory effects. I have got a microlader pro and this ist a great charger.

MfG,
Armin