Comparing PostgreSQL and Oracle stability

Hi,

I'm considering porting code from Oracle to PostgreSql. I'm looking
for opinions from people that are experienced with both PostgreSQL and
Oracle:

1) Is the stability better, equal or worse when comparing Oracle 9i?
2) Are there any performance issues to be aware of when comparing
PostgreSql an d Oracle (on the same hardware configuration) - eg. size
of table colums, count of records in tables (and indexes).
3) And how about the work for DB administrators - are things simpler
or more complicated?

Best regards
Thomas