Stardom Sumo Hall questions

For those that have attended shows at Sumo Hall in the past what’s the difference between arena S and arena A tickets. Are they both on the floor? We are headed to the show this December and we do not want to sit in one of the boxes nor on the upper deck we want seats on the actual floor. But no one seems to be able to answer the difference between these are and are they actually all on the floor if it says “arena”?

Thank you!