River cruises are more alike between the different line some include gratuities but most do not
Easy for some company to make the comparison charts for marketing purposes
Ocean going cruise lines are much more complicated
there are main stream lines, premium lines , luxury lines & expedition ship
all have their pro's & con's
Usually the upscale lines cost more but may have less to offer as the ships are smaller so not as many shows/things to do as the main stream lines
Depending on what is important to you
main stream lines seem to offer more bang for your buck
Back to your question though
No I have not seen any comparison charts except for the Oceania one you posted but you still need to read between the lines
JMO