go for the 2 Rena filters.
Much easier as the media can be swapped between them. Same with spare parts.
You shouldn't ever change the ceramics, that's what your biological bacteria are going to grow on. If you change those out you'll have an ammonia spike.
i give my sponges a quick rinse in a bucket of tank water when i do my PWC's.
since they too hold BB, you dont really want to wash that off.
and ive heard you never need to replace them until they are physically unusable (shredding, disintigrating etc).