An Oracle performances question

If in a STORAGE clause, for the creation of a table, I fix a NEXT quite large, when DBMS allocates a new extent it won't probably get used altogether so that there'll be a fragmentation of Database. On the other hand if I set a NEXT quite small it might happen that the table will be split into a great amount of extents throughtout the Database. In which of the previous situations the Oracle performances get worse?

Thanks in advance

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