actually, there is a difference, in current example it impacts on total number of records retrieved by SOQL queries limits. Limits is one of the most important challenge working with salesforce platform. try to use them so less, as possible.
E.g. you have 50000 Accounts and you need to query only one, so that query
[SELECT Id, Name, Type, ParentId, Fax, Phone FROM Account] will return all 50000 records, but you will get only one, that you need. In this case, not necessary limit will be hit. So if you know all restrictions to required record - apply them. In this case we can set, that only one record will be returned
SELECT Id, Name, Type, ParentId, Fax, Phone FROM Account LIMIT 1. In such way only one record will be counted in total number of records retrieved by SOQL queries apex limit.
also there is difference between assigning SOQL result to
List of records, or to Sobject
e.g. if no Accounts exists
List<Account> accts = [
// no exception is thrown. accts.isEmpty() returns true
Account acct = [
// exception is thrown System.QueryException: List has no rows for assignment to SObject