�Inform�tica� is the word used in Spain when referring to Information Sciences or any computer-related matter. We call computers �ordenadores� both words have been borrowed from the French.
In South America, however, the equivalent words are �computaci�n� and �computador� clearly borrowed from USA.
Apart of being more familiarized with �inform�tica� it seems to me as more precise than �computaci�n� which could means any kind of calculation with or without information processing involved.